diff --git a/.ampy b/.ampy
deleted file mode 100644
index 8bce788..0000000
--- a/.ampy
+++ /dev/null
@@ -1,7 +0,0 @@
-# These values work only for Feathers on Linux hosts
-# right now. If using Docker, requires execution as such:
-#
-# docker run -t kmk_firmware:latest --device /dev/ttyUSB0
-AMPY_PORT=/dev/ttyUSB0
-AMPY_BAUD=115200
-AMPY_DELAY=1.5
diff --git a/.gitignore b/.gitignore
index 894a44c..0f9f262 100644
--- a/.gitignore
+++ b/.gitignore
@@ -102,3 +102,7 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+.ampy
+.submodules
+.circuitpy-deps
diff --git a/.gitmodules b/.gitmodules
index 3134eff..ce7fb1a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,12 @@
 [submodule "circuitpython"]
 	path = vendor/circuitpython
 	url = https://github.com/adafruit/circuitpython.git
+	branch = "9b98ad779468676c3d5f1efdc06b454aaed7c407"
+[submodule "pydux"]
+	path = vendor/pydux
+	url = https://github.com/usrlocalben/pydux.git
+	branch = "943ca1c75357b9289f55f17ff2d997a66a3313a4"
+[submodule "upy-lib"]
+	path = vendor/upy-lib
+	url = https://github.com/micropython/micropython-lib.git
+	branch = "f20d89c6aad9443a696561ca2a01f7ef0c8fb302"
diff --git a/Makefile b/Makefile
index a716a4d..fb9f393 100644
--- a/Makefile
+++ b/Makefile
@@ -1,31 +1,65 @@
-.PHONY: build-feather devdeps lint
+.PHONY: \
+	build-feather \
+	circuitpy-deps \
+	circuitpy-freeze-kmk-nrf \
+	devdeps \
+	freeze-nrf-vendor-deps \
+	lint
 
 devdeps: Pipfile.lock
-	pipenv install --dev --ignore-pipfile
+	@pipenv install --dev --ignore-pipfile
 
 lint: devdeps
-	pipenv run flake8
+	@pipenv run flake8
 
-build-feather-test: lint devdeps
+.submodules: .gitmodules
 	@echo "===> Pulling dependencies, this may take several minutes"
 	@git submodule update --init --recursive
+	@touch .submodules
+
+.circuitpy-deps: .submodules
 	@echo "===> Building circuitpython/mpy-cross"
 	@make -C vendor/circuitpython/mpy-cross
 	@echo "===> Pulling Nordic BLE stack"
 	@cd vendor/circuitpython/ports/nrf && ./drivers/bluetooth/download_ble_stack.sh 2>/dev/null >/dev/null
+	@touch .circuitpy-deps
+
+circuitpy-deps: .circuitpy-deps
+
+freeze-nrf-vendor-deps: vendor/circuitpython/ports/nrf/freeze/.kmk_frozen
+
+vendor/circuitpython/ports/nrf/freeze/.kmk_frozen: upy-freeze.txt
+	@echo "===> Preparing vendored dependencies for bundling"
+	@rm -rf vendor/circuitpython/ports/nrf/freeze/*
+	@cat $< | xargs -I '{}' cp -a {} vendor/circuitpython/ports/nrf/freeze/
+	@touch $@
+
+circuitpy-freeze-kmk-nrf: freeze-nrf-vendor-deps
 	@echo "===> Preparing KMK source for bundling into CircuitPython"
-	@rm -rf vendor/circuitpython/ports/nrf/freeze/kmk
-	@rm -rf vendor/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
+	@rm -rf vendor/circuitpython/ports/nrf/kmk*
 	@cp -av kmk vendor/circuitpython/ports/nrf/freeze/
-	@cp -av boards/klardotsh/twotwo_matrix_feather.py vendor/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
+
+circuitpy-flash-nrf: circuitpy-freeze-kmk-nrf
 	@echo "===> Building and flashing CircuitPython with KMK and your keymap"
 	@make -C vendor/circuitpython/ports/nrf BOARD=feather_nrf52832 SERIAL=/dev/ttyUSB0 SD=s132 FROZEN_MPY_DIR=freeze clean dfu-gen dfu-flash
+
+circuitpy-flash-nrf-entrypoint:
 	@echo "===> Flashing entrypoint if it doesn't already exist"
 	@sleep 2
 	@-timeout -k 5s 10s pipenv run ampy rm main.py 2>/dev/null
 	@-timeout -k 5s 10s pipenv run ampy put entrypoints/feather_nrf52832.py main.py
 	@echo "===> Flashed keyboard successfully!"
 
+build-feather-test: lint devdeps circuitpy-deps circuitpy-freeze-kmk-nrf
+	@echo "===> Preparing keyboard script for bundling into CircuitPython"
+	@cp -av boards/klardotsh/twotwo_matrix_feather.py vendor/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
+	@$(MAKE) circuitpy-flash-nrf circuitpy-flash-nrf-entrypoint
+
+build-feather-noop: lint devdeps circuitpy-deps circuitpy-freeze-kmk-nrf
+	@echo "===> Preparing keyboard script for bundling into CircuitPython"
+	@cp -av boards/noop.py vendor/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
+	@$(MAKE) circuitpy-flash-nrf circuitpy-flash-nrf-entrypoint
+
 # Fully wipe the board with only stock CircuitPython
 burn-it-all-with-fire: lint devdeps
 	@echo "===> Flashing STOCK CircuitPython with no KMK or user keyboard scripts, and wiping entrypoint"
@@ -38,10 +72,9 @@ burn-it-all-with-fire: lint devdeps
 	@echo "===> Pulling Nordic BLE stack"
 	@cd vendor/circuitpython/ports/nrf && ./drivers/bluetooth/download_ble_stack.sh 2>/dev/null >/dev/null
 	@echo "===> Preparing KMK source for bundling into CircuitPython"
-	@rm -rf vendor/circuitpython/ports/nrf/freeze/kmk
-	@rm -rf vendor/circuitpython/ports/nrf/freeze/kmk_keyboard_user.py
+	@rm -rf vendor/circuitpython/ports/nrf/*
 	@echo "===> Building CircuitPython WITHOUT KMK or user keyboard script to induce ImportError"
-	@make -C vendor/circuitpython/ports/nrf BOARD=feather_nrf52832 SERIAL=/dev/ttyUSB0 SD=s132 FROZEN_MPY_DIR=freeze clean dfu-gen dfu-flash
+	@$(MAKE) circuitpy-flash-nrf
 	@echo "===> Wiping keyboard config"
 	@sleep 2
 	@-pipenv run ampy rm main.py 2>/dev/null
diff --git a/boards/noop.py b/boards/noop.py
new file mode 100644
index 0000000..024987e
--- /dev/null
+++ b/boards/noop.py
@@ -0,0 +1,5 @@
+import sys
+
+
+def main():
+    sys.exit(0)
diff --git a/upy-freeze.txt b/upy-freeze.txt
new file mode 100644
index 0000000..97cb5b7
--- /dev/null
+++ b/upy-freeze.txt
@@ -0,0 +1,4 @@
+vendor/upy-lib/__future__/__future__.py
+vendor/upy-lib/functools/functools.py
+vendor/upy-lib/string/string.py
+vendor/pydux/pydux
diff --git a/vendor/pydux b/vendor/pydux
new file mode 160000
index 0000000..943ca1c
--- /dev/null
+++ b/vendor/pydux
@@ -0,0 +1 @@
+Subproject commit 943ca1c75357b9289f55f17ff2d997a66a3313a4
diff --git a/vendor/upy-lib b/vendor/upy-lib
new file mode 160000
index 0000000..f20d89c
--- /dev/null
+++ b/vendor/upy-lib
@@ -0,0 +1 @@
+Subproject commit f20d89c6aad9443a696561ca2a01f7ef0c8fb302