Any roofwalk can be removed with the right tools and enough work. In this case, the first question is, "Do you want to save the roofwalk?". If not, the only hard part will be filling the holes so they don't show. If you want the roofwalk in one piece, it can be done, but you'll have to work carefully.
I replaced both ends of the floor with styrene sheet and body mounted 1025s on brass strips for a simulated cushion underframe. That's much easier than trying to grind down the odd factory mounting, and looks a lot better than the existing coupler. The factory coupler comes off easily, and can be used on another car, if you have one that needs a similar coupler.
