Switching to QFN is what I’m hoping for, this will allow switching to a MCU with more pins as well as more memory. Toykeeper has started work on making Anduril compatible with an 841, I don’t know how much progress has been made or if she has any hardware to test with.
There is a third programming key but it is Lone Oceans design and used on the GXB172 driver. [ GXB172 - 50W Single Cell 17mm Boost Driver! ]
IIRC you were given a GXB172 driver for testing. Did you come across any hardware problems?