This is a long shot, but depending on how much of the private key is there, you might still have a shot at recovering it.

https://medium.freecodecamp.org/lets-enhance-how-we-found-rogerkver-s-1000-wallet-obfuscated-private-key-8514e74a5433

I don't know if you have the QR code or just the private key string, but in the above article they were able to recover an obfuscated private key from a video interview with some math and python.  It's not likely, but might be worth taking a look at.