Various bone tools would be my first point of call .
I'm thinking the best way to wake the old glue up so it's payable would be a hot air gun lightly over the face . But this brings the question of will it damage the surface ?
Obviously not done this myself mate , looks tricky but doable . Looking forward to seeing the end result ? .
The one in the picture, is that said facia ? Post a picture of what it's going on . Why can't you just swap it ?