it will be implemented by chips-on-camera, that will tie you to a picture. it will be pushed forward by law enforcement ("think of the children!") and it will be great for profits. not so much for privacy.
If you do come up with a 100% fool-proof implementation of this, you'll be able to get a lot of money for it, so do give it a try! Many have tried before you, yet it always turns out to be short of impossible. But who knows, maybe there is a way...
> We absolutely need certified no-AI digital proofs.
You can mitigate this by having a pool of devices (eg. 1000) share keys. AFAIK TPM chips and U2F/FIDO keys do this to provide some anonymity while limiting the blast radius if a key does get leaked.