We used an unsupported version of 12.0 for several years before upgrading to v19.

during that time, we simply used the alternate interface method of transferring the data manually.  

I still need to refresh myself on this method for the upcoming support drop, but it should work the same as it did in 2018 through 2021.

You can check this out for yourselves. It involves downloading into a file the data to be interfaced, then also uploading it manually. 

No guarantees, as  stated -  have not reconfirmed this, and I could be mistaken about which modules interface. 

At the time, we were transferring the remote location into the HQ location.  Perhaps this is different that the actual Financial Exchange function, but for anyone who might get an inspired idea based on this comment, then let it be so!