Well I'm new to this and site and model editing but since I found the Druid Cat form -> Worgen model change I've been loving my druid again so I've been playing around with Mywarcraftstudio and you can still get the cat form transformation to work and stuff like it to work on the PTR grated this takes an annoying amount of fiddling but basic stuff like this can still be done pretty easilly
I hope someone will make a patch that disables the signature-checking, so we at least can edit in the Blizzard-MPQs. I have yet not found a way to ED, so this nerf is bad, bad news for me :<
Just set up a 2.2.3 private server for yourself, it's very easy and can be done in ~30 mins to an hour.
There is a fix for 2.3, but like Fault and many others have suggested your search "google" for it. Because it's NOT getting released here.
Even if I found the way on a private server, I would need to test it on live before I'm satisfied
Hopefully I will somehow obtain that 2.3 fix :>