I'd like to have a grip that I can connect to Warthog base and have exactly the same physical buttons mapping. I have to avoid the situation like pressing CMS Down and then Trim Left will be pressed according to Warthog base.
You suggest that grip in question is Suncom F-15 and you want use MT-02 "navigation switch" as two HAT's - "Auto Acquisition Switch" and "Castle switch"
Originally Suncom F-15 is 8 buttons + POV HAT
If you add a 2nd stage in trigger, 3 buttons in "Auto Acquisition Switch" (like F-15 stick ) became 12 buttons + POV HAT. Can be 13 if ad a Paddle (Pinky) button.
But can add a Paddle and an extra up-donw-press switch, like in Tm F-18 grip prototype and have 19 buttons +POV HAT - what is the same of Warthog grip.
What is the specific difficult in wire Suncom buttons in above linked Shift Register (3x CD4021)?