There was no F-9 that I can remember.
For the 4x 50kg loadout, I believe Pyro or somebody asked for some info about it from the forum goers when they started remodeling the Bf109 lineup (we had some folks with nice reference libraries at the time, still do I suppose) but from the forum feedback there was too much noise and not enough valid info answering the question.
Then we lost the bomb rack on the E4 and F4, so I assume HTC decided it was too scarce or that it wasn't worth modeling at the time.
Not sure if they'd want to do the 4x 50kg rack now, after the fact.
Personally I don't think it would lend much to a Fw190F8. The 50kg is so weak that the 250kg is far far better, and the 500kg generally best for GV popping. Or the rockets!