These just don't work for me at all. They look like they should have deep voices, or pretty deep but scratchy old man voices like Danny Devito. Actually, scratch that: Danny Devito is a little thing, these all look like they should have big, booming voices like Santa Claus or deep voices with Brookyln used car salesman voices. And it's not just the voice that doesn't fit, it's the way he moves and acts and all his mannerisms.
The only human Bill I can imagine with the voice and mannerisms used in the actual show would by Imp Bills like Mxy from Superman, who is pretty much the same character. These don't feel like the same character.
It's also why that Bill voice Alex used works on King from the Owl House when he recycles it, who is a little puppy.