HELLO! I finally came back to update this. Everything is retargeted and you do not need IVCS anymore! It should work just fine with other skeletons though. I have to make manual adjustments to the sitting and sleeping animations since they have you float so please use the Heels plugin to remedy it for now.
I was missing my animation swaps from Everyone Emotes and I went to make one of many animation swap packs for my alts. This takes all the idles, ground sits, and movement animations into the Viera ones. Crush the posh Ishgardian posture with better ones!