Here's an idea: Instead of putting a Frozen overlay on Maelstrom, why not put it on...Expedition Everest?
Think about it: replace the train with sleds. Put a lot more snow all over everything. Replace the queue with an Ice Palace motif. And best of all....replace the yeti with Olaf. He's a hell of a lot smaller, so it'd be an easy AA to maintain. Or just keep the yeti figure and spray fake snow all over it; then give it minimal movement, have it roar a little or something. It'd look like Elsa's big snow-henchman from the film. Heck, TDO could put a little show scene in that cave area, with Olaf, the reindeer, perhaps Anna and Kristoff.
And the lame yeti screen (where he's tearing up the tracks) could be replaced with Olaf too. At least in that case the obvious animation wouldn't seem so fake and jarring. Also in that area, an Elsa AA could sing "Let It Go" and the room could sparkle like she's making magic ice and whatnot.
Believe it or not, I'm only half-kidding here. EE is a failure. TDO is always getting ribbed about it. Well, TDO, here's the solution. Think about it.