That 1/4" rivet is commonplace among ALL body shops. I'd drop the door panel and have a local place shoot a rivet in there with the proper tool. The...
I would order a generic actuator to replace yours. Yes, it does need to be riveted in. Same size as window actuator. I purchased a pack of rivets at...
As far as butchering.... you'll only need to trim the inside lips. Can be done with a utility knife. Will not effect reinstalling the OEM headunit or...