Hmm I wonder if antimicrox would allow you to combine two inputs into one composite input, I don’t have experience with it so I can’t say for sure but it seems like the kind of utility that would.
https://github.com/AntiMicroX/antimicrox
What I would do in this situation is map the controls to keyboard, then use a Controller-to-Keyboard mapping program to map all the controller buttons to the keyboard buttons. So map both controllers D-Pads to W-A-S-D (or arrows, or whatever really) then set those keyboard controls to your movement controls in the emulator.
Hell yeah! Go play some videooooo gamesss