Use Taiko drum for random games

I bought a cool rhythm game (Taiko no Tatsujin) and I got the drum controller to go with it. While playing with it I thought it would be fun to try and use it for games obviously not made for this kind of controller.

I thought about it and after a little bit of testing with my computer and switch, there are only 4 total buttons (besides the ones that are used for a normal controller), and I would love to be able to hit 2 of the buttons at once and it register as a 3rd press kind of like how the game I got the drum for works. Basically if I’m using an NES emulator I would like to be able to hit the drum in both the middle parts to register an A press or something similar to that.

Is there a method available to register a multi-button combo on my controller as a different button entirely on the controller? (E.g. X = A, Y = B, Z = A+B)?

Further information: I would like this to work for the JNES, SNES9x, and VisualBoyAdvance emulators at this time. Having to use a different emulator for these systems is okay too.