I like the idea! You could use rp2040 tiny to eliminate those giant 0805 package resistors and you could use back mosfet locations to unnecessarily opening apu shield. This way everything can be on back side of the board and as a bonus you can decrease flex cables to one piece.A friend sent these to me. I only tested the adapter on an old HWFLY modchip and its giving me conflicting results. I'm still waiting for my batch of rp2040 tiny to arrive tomorrow or after tomorrow to fully test on a fresh console.