Could you possibly add a 1.75u Enter or a 1.75u R3 Novelty?
Prime-E, JD40, JD45, AMJ40, SP40, The40, BM43a, Daisy, Pheonix45, Nightmare, Neko, UD40, Chicory, Mechmini, and more - almost all non-Minivan 40s use 1.75 enter.
I get that there is physical compatibility with the 1.75u control, but come on like two thirds of all 40s boards use the 1.75u enter and it is extremely annoying that it isn't included in the minimal-40s compatibility base sets.