Hmmm...
the license is valid until revoked, but the piece of paper no longer counts as your license. Perhaps you can try renewing it? And then do a BFR.
It certainly seems unnecessary to retrain for the PPL...
Was it a standalone one? Then you can get a re[placement cert, which will be a plastic one.
If it was based on another license, you may have to go through the validation process, that will take time. Maybe longer than six months to complete, and include a trip to a FSDO.