Wish me luck.
Kinja support (yes, it exists) can’t seem to give me a straight answer whether I’ll be able to keep my posts or not. Seems like the problem is I can’t change my display name without changing my user name, since for some odd reason underscores are not allowed in the current system, yet when I first signed up for this account it was.
Oh and if I can’t get post back to Oppo... if the mods can add me back.
EDIT: ...and looks like it worked! Still on Oppo.