Declutter and denoise the debug output in general.
Avoid f-strings. They're nice to look at, but use a lot of ROM, RAM, and time during formatting.
Remove all "debug" information from KMKKeyboard.__repr__. It's printed out once at init and the info it gave was useless at that point. Even more free memory.
Add a memory footprint debug info after initialization.
KMKKeyboard.__repr__. It's printed out once at init and the info it gave was useless at that point. Even more free memory.