My parents used to silk-screen magnetic stick-on car door signs. Cut sheets of the blank material into strips and use flush rivets to attach to the boattail. With some marginal grip around the whole perimeter it would help affix the tail to the vehicle. There might be ~1/8" step at the edge, a router should be able to chamfer that.
It might be tedious to peel and tape back each piece to release the -tail, but why would you want to do that?
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