I still specifically want Felix to learn a bit of earthbending. I know Korra's mun said it wouldn't work, but I really think it would, and I can provide justification at any moment.

Also, if things go as planned, he will at some point need someone to initiate/direct his vision quest thingy. Because the boy has issues, and I don't see any way short of a "journey to the center of the self" that he'd face and resolve them.

Although she probably could have, Fluttershy didn't come to Milliways for her training montage in "Hurricane Fluttershy". Which is possibly for the best, since part of it was learning to deal with the presence of other ponies, and there aren't very many of those here.