For example, when morphed as a piglin, pressing a button will play a bunch of random piglin noises, now not each animal gets their own hotkey but like when morphed as a certain animal, pressing that one key will play that noise

OMG yes please! this would be super awesome.
And an optional configurable time delay limit in config if you want to prevent people from spamming it rapid-fire and being super obnoxious.

I agree