The only part I'm worried about the WE rework is that their economy basically reaches a ceiling in ME. Once you get all forests up and running, that's it, your economy basically has no growth potential at all (and likely pissed off tons of people on the process; just dropping into the Gaean Vale likely means all of the donut declares you sooner or later, among others) and I don't know if you'll have the armies to fend off all the doomstacks coming your way on VH/Legendary, especially given that your dominion is spread all over the place.
I may play them in Vortex, AI empires running rampant is much less of a problem there. Skaven I'll definitely play in ME, although Hellpit looks like a hell of a start sandwiched between Kislev and Kraka Drak, surrounded by angry vikings, not too far from the Franz blob, and literally the first stop for the Neverchosen.