So this just happened:
I got everything desoldered from the NES2 board and left the cartridge slot for last. I thought I had every pin desoldered enough so I tried removing it as carefully as I could. Guess I missed a few…
I guess I’ll have to either buy another board now or maybe I can somehow find just the cartridge slot itself for sale. That and I burned the same thumb twice in 5 minutes.
Update: Apparently you can just slide these pins back in and it will all work again. So I’m gonna try that and hope for the best!
Update 2: I think I did it! Hopefully it still works.