How to assign the correct player controller to gamepad

So I am trying to make basically a mockup of super smash. ( just local multiplayer)

Say you are at the character selection screen, and that I have 3 gamepads plugged into my computer. First off, how would I set it up so that pressing A on a gamepad creates a new player the way it does in super smash. Further more, how do I say “set this gamepad to player controller 0, and this one to player controller 1” etc. I am a bit confused about this.

I am looking for the same thing and no one seems to know how to do it…

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Yes, interesting how this is so difficult.