I went out to the garage and took a look. I think the 400F brake pivot will work and it has an arm for the spring already attached. I'd still have to move the switch bracket.
Or, weld a small tab onto the 400F brake pedal and keep the 500 switch location. That way, I can return it to stock if need be.
Brent, I see you removed that "guard" or loop or whatever it is from the RH side foot peg. It looks like it will be in the way even with the 550F kick pedal. Easy enough to remove, I guess.