It might be okish, but there are several potential problems:
- the protector may be able to move a bit. This could make things not line up properly (temporarily) and look a little funny. It would also make this potential movement very visible. It also might not move at all..
- the overlay could get worn out from direct contact. I believe most people put a protector OVER an overlay
- you would have a space between where the lights shine through an insert and where the insert artwork is. This may look funny.
- you would have to trim a bunch of stuff off the overlay if you’re afraid to remove all the parts.

What if you trimmed the overlay to match the protector, then found a way to attach it to the underside of the protector? That’s not perfect either, but it seems a bit better than sticking it on top (at least to me). It would kinda be like a low level “Hardtop” (I installed one of those, too)

FYI, I’ve got a couple protectors (on Paragon and PinBot) but no overlays…

Jeff