In FP(the OP) everything in Revelation is seen as fulfilled prior to ad70 with maybe the exception of the white throne judgment. That's why it's important to them to defend the writing of Revelation and show it written prior to ad70. So anything and everything in Revelation has to be fulfilled prior to ad70 for FP to be correct, Rev. 13,,,AoD,,mark,,, everything.
The problem I see with your "stance" is that you are attempting to relate the "buy or sell" passages with the zealots minting of coins etc. John may not have had them in mind.
You need to establish that John is speaking to the "minting" issue and not some other issue rather than assuming,