Would it be possible to use a dremel to slice off the edge of the mounting plate that’s blocking the X button? It’s really only there to fit seimitsu sticks, and even if you were to fit a seimitsu in im pretty sure losing only one of the six screw points wouldn’t affect the mounting much, if at all.
edit: also, I’ve seen pictures of the inside of the HRAP2 and you’re right about the mounting plate being right in the way. It looks fixable by dremeling off the corner though. What I can’t figure out is why the x button is so much closer to the mounting plate than the t5 hori stick, which could fit the screw in’s easily. Is it just because the buttons are just abit closer to the stick, or did the mounting plate get huge? o_O