Original purchases can be made in Tether.
this is not a solution it is a disaster. because tether is not a good choice ever.
first of all you said there is no "paper trail" but when you use crypto you just cut the bank, but you are still making a trade and it is registered somewhere!
everything solved!
you see when you want to accept a new form of payment, everything will come down to the rules that the two parties agree about in the contract. you think ahead and set these rules and you both sign them.