I seem to remember a thread where a fellow installed a PTO driven snowblower on his loader arms. I am not sure if he limited the travel of the loader or how exactly he handled the limited range of u-joints and pto shafts.
Anything is possible as Greensvillejay has mentioned. Does your B3200 have the optional mid pto? I think that would make the modifications a tad easier. ONE (and there would be many) of the problems of trying to run a pto driven implement on the front of your loader arms is how to articulate the pto shaft when raising or lowering the loader?
Is your main goal by putting a cutter/slasher on the loader arms to be able to elevate the loader and cut vegetation up higher than what a 3pt mounted cutter is capable? If so, a Lane Shark would be a better solution although I do not know if your tractor has sufficient hydraulic flow.
lane-shark-ls-3