I’ve heard that some people will put a Mercedes logo on a Smart Fortwo, but then a Smart is a Mercedes in a way, sort of like how Scions and Lexuses are Toyotas. I think some car companies use different logos in different countries - at least historically, Toyota cars sold in their home country were always Toyotas but when they were exported they would sometimes get a new brand name like Lexus or Scion pursuant to whatever marketing strategy they had for that market.
Window tint is a safety/visibility issue. On my last car I had the side and back glass tinted (nothing too drastic) and I noted that driving to work in the winter (still dark in the morning) it made it very difficult to see if pedestrians might be in the crosswalk while I was making a turn. I decided not to have tint applied to the car which replaced it.
As for police identifying a vehicle, the VIN defines what the car is.
Back when the Mustang and Capri shared all but a few trim pieces, there was a fad of putting Capri taillights (with the fine horizontal bars instead of the Mustang’s 3 blocks) on Mustangs, and vice versa. There was even one that was a Capri from the rear view and a Mustang from the front, badges and all.
I have considered putting Ferrari badges (I have a complete set from a 308) on my Cobra, which is hilarious/blasphemous if you know those marque’s history…
When we had a Toyota Tercel, I snagged a nameplate from one of the 4 wheel drive models and bolted it on the grill so I could go thru chain-control areas without putting chains on.
I’ve got an “ix” on my 325 for the same reason. It also has custom-made Grateful Dead* “Steal Your Face”* emblems in place of the round “BMW” emblem. I also stuck an “M” from a M5 on the grill, which was good for about 60 extra horsepower.