6. Batch "TA" 1S or 2S Bistro HD OTSM/NarsilM drivers 15-47.5mm size fit, S2+, C8, H03, MF01, MT03, Q8 Clicky or E-switch

as far as I have seen the X6R uses switch on the main board and another piggy back board for charging and AMCs
It may be possible to add one of my drivery, you may sacrifise the charging board, like here and here

if the driver cavity is deep enough yopu may use charging board as well