@Hunter216 it doesnt have to be plexus. The term to research is "MMA Adhesive".
There are tons of companies breaking out into this market. There are different formulations for longer worktimes and thinner inconsistencies. They are all high dollar though and small quantities.
Epoxy (west, total boat, marinetex) all work great on dings and dock rash. It adheres to the luran well, but as others have said, doesnt alter the luran at all.
If you have a chance, look at the technical sheet for plexus...very little gap coverage, 1/8 inch. it not supposed to be used as replacement substrates. Its for bonding substrates together.
In the future, one will wave a scanner or the area, edit the point matrix, then send the results to a 3d printer loaded for acrylic. The replacement part will then be glued on.