At this point you have a playfield with mylar removed.

The next result is a vibrant and colorful playfield with missing art on the inserts and some paint lift

Trying to be as positive as I can - You just need to find pictures, or a scan of a good playfield and then produce your own decals. You can then look at clearcoating the playfield, or laying fresh mylar.

All is not lost !

You could even contact the producers of current decals sets - they may have enough numbers to reproduce a set ?

On the matter of decals and clear coating. Is this possible as I think I've read that inlays seem to react with clear coat. Am I mistaken??