@PetVal / @Balpien.Hammerer / @PoppetMcGimsie thats already absolutely possible.
About 3-4 months ago @thoys demoed it at a meeting after finding out when playing around with Code. Specifically
I even use it as the main method of defining Seat positions at the same time to test if I can get it to sync with a dynamic entity.
You can attach avatars, and entities to a specific bone of an entity, and when animating that bone you also move the avatar or entity in sync with the animation. You just have make sure to sync the avatars position and rotation in the frame your are attaching the avatar in, after that you no longer have to sync
The main problem arises when the entity it self moves via Physics, not when it is animated