I think I would have left it in place. The 3.0 badge makes it clear to sticklers that it's not an actual RS.
However, just about any decal combination is going to look good on that car.
It's easy to get carried away with this stuff. For the record, the teenagers who wear Lakers jerseys to school aren't actually members of the team, either.
I don't think they're living too much of a lie.