That F-122 spacebar is a problem. I have enough parts to build another F-122 - except for a spacebar.
When I get some spare time, I am planning to make a bracket to use the Model M spacebar, with its thicker wire. I believe it is the same, otherwise.
I think that I can make it out of metal, wire maybe?, to the right height, and epoxy it on. Shouldn't be too hard, and I could bend it up and down until I got the clearance just right.