BFH!
Seriously, you probably could remove the bracket without removing the pedals, but it would be easier (and let you check the pedal bushings) to remove the pedals, then the pedal shaft, and then the bracket. Pdeals are really not a problem to remove and even if you don't replace the bushings, you can clean and paint everything easier with it all disassembled.
When I was trying to remove the original bracket and pedal shaft from my 53 3/4ton, after removing the pedals, I just kept spraying with penetrating oil, putting a block of wood on the outside (of frame) end of the pedal shaft and banging several times with a BFH. Eventually it moved a bit and I just went to work with penetrating oil and banging.
