TL;DR how would you solder arcade buttons to options and share buttons respectively?
Looking to build an arcade stick using a jdm-040 as the pcb because cheap with reliable latency. Everything but options, share, touchbar, L3 and R3 can be have buttons soldered on by scraping away at the top layer of whether the daughter board connects to the main board, shown to work with earlier models here (
https://youtu.be/AklutmWoFXw).
With the size of the connector pins on the L3, R3 and touchbar pushbuttons I could solder wires onto those points fairly easily, however the problem comes with the option and share buttons.
The buttons/vias seem far too small to reliably desolder/solder without damaging the board in some way. Further l can't find any clear path from the visible layers of the pcb to these buttons (The main thread showing jdm-040 pcb vias doesn't seem to know either), so I have no clue which vias connect to options or share. Ideally I'd like to have all 14 buttons and the d pad usable so would really appreciate if someone knows whether there's any practical way to solder an arcade button to mimic/replace the options and share buttons.
Also if someone knows the specific voltages to neutralise triggers that would also be super helpful as the board has drifting analog sticks.
Thanks.