This almost certainly wouldn't be anything similar at all though other than "comic books" given the tone of Ragnarok. Bale could be lining up for a largely comedic role.
That's a pretty good guess, especially if they are lifting from the Jane Thor comics. Ties in with Malekith and the Frost Giants as well, so a lot of familiars. I'd be surprised if they bring Malekith back, though he was wasted in Dark World.
If they bring him back, they’ll definitely need to re-cast.