The child in me wants to guffaw at someone asking for a HP HYFTH, Cosmos, 3RPM, etc. for one of the School Choir 45s. (If I had doubles of those Top TMRs, I still wouldn't trade one away for a SC 7".)
However, in my 35+ years of record collecting, I've seen waaaaaay crazier things, so much luck to whoever puts out that trade.
I've effectively curbed my completist attitude toward everything TMR, while many others have not. I'd pay no more than $175 for one of them—and I'd only want one, just to have an example.
"I'd wish you happiness, but I know it'd be detrimental to your art."