OWe can refine that idea, (or maybe this is just a gross overcomplification? 😅🤷🏻‍♂️)

Take the sats card as an example. But to make it even more private we change hands with them regularly so that no single card can be tracked to an individuals movements. Here is an example transaction:

You have several sats cards in your wallet, loaded up like traditional cash notes: some 5's 10's 20's 50's etc... you buy a coffee, instead of scanning the sats card you just hand over a loaded 5 and get a seperate one back with the change scanned in from the PoS. The cards would all change hands so much that not one card could easily be mapped to any individuals movements, when you have a few of these "change cards" you can consolidate them at home or wherever, restock and go again.

Any individual would probably only ever need 5-10 sats cards, if they could be made thin and cheap enough I think it's an interesting concept.

Or to take it to the next level, have a small device like these pop-up card wallets but intead of many cards there is just one card slot for the sats card and a small screen to program how many sats to load the card each time you need to use it, then you hand over the loaded card and get a blank back. Could this work somehow 🤔 obviously building out the infrastructure would be a huge hurdle 

 "...go back to trading MtGox cards IRL..."

How is this different from trading gold coins, ear rings or necklaces?  Gold has mostly the same properties as bitcoin, with the only real difference being weight and transmission through ether.  If you bury gold in a remote location it's almost as inaccessable as encryption.

There are no wrong answers in brainstorming and I don't want to slow you down, but this is way off track.  The fact that no KYC wallets are getting attacked tells you they are right over the target.