If you’re working through the writer portal on a computer, you could accomplish a similar effect by spot directing the overlay.
Something like that (obviously the spot directing would change based on your position), and you could copy and paste the shifting direction multiple times. It won’t sync up perfectly, but it’ll imitate the movement you’re looking for.
I don’t know how you could keep the animation going when dialogue is happening, but if you want other actions to occur you can just use the ‘&’ sign to make the overlay movement sync with the other animations.
I tried with your indication, it doesn’t quite work out (or it’s probably me ) but I appreciate the time you dedicated by helping me and your quick response.
I’ll keep your advice, it always helps.