It took a while, but I'm now finally able to make sneak animations :)
Next month, I will be working on sneak movement animations and sneak attack animations, expect the attacks to benefit from the SKSE Plugin Animation Motion Revolution, which I've been testing and tinkering with extensively for a while now.
Attached, you'll find the sneak test files showcased in the video, if you intend to use them for your playthrough, I would highly recommend using 360 Movement Behavior.
Loosely inspired by MGSV.