Yeah, these are really nice! Actually, we already have a similar effect for some props that's achieved via Swyter's wavy banner shader, but it's harder to notice and not as accurate as your way of doing it.
I feel like your props are waving just a bit too much. Like on a very windy day. I understand you can change the interval in the prop script, but I'm thinking of the amplitude, ie the maximum distance over which the vertices move. Do you think you could make a version with less movement, or would that be too much of a hassle?