In my opinion, it takes only a few minutes to get through all the toadette achievements. So, it wouldn't be much faster than AUM.

Try suggesting that here: https://www.speedrun.com/smomemes

Not really. It's just a different and slower way to do AUM-it's barely significant enough to be a category imo, much less put on the main boards.

A shorter way rather, without jump/cap/coin farming, less shop visits, less purples, more options for the painting route.

It would still definitely be a CE, but different from AUM in a lot of spots where purple coins are nearby

Who would run it though? Timpani doesn't seem to want to do a shortened AUM.