Yeah I know a FR/BE set won't ever be made

Completely understandable too if you don't have enough people for it.
I already contacted the seller, well contacted him again, so let's wait for a response and I will post some pics and details whenever I receive it. When I get a response I will ask if he has more than one set. I doubt it however since he only mentions one in his listing.
I'll probably do a stem mod to make it work for MX, or participate in one of your upcoming GMK GBs. I'm still regretting not getting that CMYK set btw. But I spent too much money on keyboards in that period so I couldn't justify it!