It pretty much is already. With applications like JKSV already there, all that'd really be the defining problem is updating the applications that let users gen their Pokémon like PkHex.
Heck, you could use some applications from
3DS Homebrew to make it so that you could have Galarian forms before you even have a copy of the game, assuming the basic structure of the Pokémon and their forms are handled the same way as in past generations.
I'm not gonna say to go out of your way to do it (unless it's something you wanna keep to yourself, then by all means, I understand) but as it stands, it's pretty easy based on existing tools and apps.