Velcro itself has almost no spring-like properties since it is designed to be fairly rigid, so it would not help to decouple the vinyl if used with 100% coverage. However, I think you're suggesting use velcro to hang it on the edges and leave the rest of the vinyl floating which is the recommendation I tried to make in the conclusion. If the vibration along the edge of the vinyl is "far" away from the middle of the vinyl where it is floating, the vibration isolation is excellent.
Do I conclude that I want it to hang, or do I still want a layer of something else under it?
And do I still want neoprene layer for the Velcro to attach to?