This is already how Joinmarket works. You can make payments using joinmarket... to 3rd parties. In other words a 'coinjoin' of sorts happens except the utxo goes to a third party and you still receive the change.
Joinmarket - learn it and love it
0 sats \ 0 replies \ @kruw 6h
Paying third parties using a JoinMarket coinjoin doesn't add privacy because an observer can still calculate which inputs belong to the taker and their change.
To use JoinMarket privately, you pay your own wallet with a coinjoin sweep for any incoming UTXO or any change UTXO created from a payment. Then you wait as a maker in between your own transactions to get paid for contributing remixing liquidity.
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You're the second one pointing me to joinmarket. I'll explore it deeper, thank you!
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