Nvm, not sure how to close the post but I ended up figuring out it's best to do it myself.
Watched a video on making dissolves which literally explained how all of this works and if anything, it makes a bit more sense for my avi since I didn't really want it sliding in from nowhere.
Set world constraint > poi> dissolve + anim on/off. In this case, I can see that using VRCFury in conjunction will just make this whole process easier for me to migrate the asset between avi's.
If anyone else runs into this from a random search I can update the post accordingly to link to the sources I picked up on.
Cheers all!