Its been a while, time to pay the bounty.
I think I might have to increase it next time to get some more responses.
What I'm looking for is a static QR code for onchain & one for lightning that can be printed out and put on display while I busk.
Some suggestions that are good ideas but we are perhaps too early are BIP21, paynyms and lnurl.
Paynyms and lnurl only work if you already have one. It needs to be the most basic & usable for most if not all wallets.
Bip 21 would be AMAZING! This should be a priority across all wallets to integrate.
So for lightning Zeus does have a static QR which I found here:
As for onchain, I found evidence of btcpay (which i was surprised no one suggested) also being able to print out a static QR here:
So thanks for your responses. The bounty goes to darthcoin for introducing Zeus albeit in a brief way.