For the flash adapters, I’m assuming two different designs may be needed. One is the 4x2 or 5x2 arrangement used by Lexel and HarleyQuin. The other is a 6x1 layout. IIRC, both use a 1.27mm or 1.3mm spacing in the wide direction, and 1.5mm between rows.
That 6x1 layout might even be available as an existing part, perhaps, but I haven’t found one with pogo pins. Anyone know if there’s one available, or would we have to make something custom? There are plenty of off-the-shelf parts at that size, but I don’t know of any with spring-loaded tips.