This is very much needed. But at this point in time only those shop owners aware and critical of CBDCs will be open to the overhead costs that accepting Monero means. A solution needs to be integrated into the point of sale system or it won't happen.

And maybe it's even the wrong approach to make people adopt something they don't deeply understand.

Bring your business to Coincards, Bitrefill,... They are ecomocially incentivised to make your coins work everywhere. And you can be as anonymous as with a native Monero payment and it's much faster than trusting in the merchants provider 0-conf policy.

Instead of a marketing flyer, which would be something that I would simply ignore, I would produce a document that is plain and simple (b/w). Can be easily printed by anybody. A document that can be easily spread in person or anonymously. A document that is in active development hosted on Gitlab or nostr and constantly refined to deliver a clear message that is all about "A future without cash" and what it means for individuals, shop owners and society at large. And how shop owners can make a difference by doing their part to create the future they want to see.

Don't teach them how to construct a boat and sail (adopt the vehicle). Instead make them desire to explore the seas (contribute to and desire freedom in wake of ever more oppressive control grids).