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The only issue you would run into is having to decide whether you want Neutral Attack or Neutral Special on Z since you only have 1 bumper.
Like this has been a thing for years now:
https://www.reddit.com/r/SteamController/comments/9u7qw4/getting_to_work_a_gamecube_controller_with_steam/
That's literally the first result for "steam input gamecube controller" and it's over 5 years old, so this isn't secret knowledge or anything...
I honestly never used the GC adapters, only the Playstation 2 adapters, so I am figuring my assumption was correct based on the first reply in that reddit post and don't have first hand experience; but that post is pretty much exactly how I would have tried to do it and they say it works so ... *shrug*
Does it send data to your PC as XInput, DInput or SwitchInput? Hard to make it work on 99% of games otherwise.
So it's a niche proprietary exception rather than an established standard.
But to my understanding, seeing online, those adapters should have a switch to change input mode, so it may as well not be necessary.
If that fails, can also use SteamInput to possibly overcome incompatibility issues. Right click the game>Controllers tab.
It's a niche exception but it's also a niche genre of fighting games. Most of the time targeted towards the melee audience. The genre has gotten a bit more mainstream since ssbu but it's still struggling. The GC controller still remains the gold standard for the genre, though. Just like a an arcade stick is used in a traditional 2d fighter
The funny thing is that modern arcade sticks use XInput however. DInput should also work, if it's not natively accepted by the game, you can use the SteamInput system I mentioned to configure the controller and turn it into XInput, and it will work.
You may also look for community software projects like Delfinovin that turn the input of those adapters that can't switch to XInput by themselves, into XInput.
Too bad 8BitDo doesn't make a wireless mod for the Gamecube controller, it could've been fun.