I made it to Greensburg, IN today and swapped truck lids, so I now have a spoiler.

Very simple to do - much easier than drilling holes and aligning everything.
It was weird because my trunk lid sat high on his car even after adjusting bump stops. I told him we could switch back if he wasn't happy, but he said he was sure he could get it adjusted right later on.
And this was another mod that was grandfathered in.