Well the Russians were transplanting dog heads in the 60s so attaching the brain to artificial life support should be very feasible these days, still not a safe procedure but of course interrupting the blood supply to the brain however slightly never will be.
Then there's the matter of hooking up the brain to a remote operated robotic body (on-board life support would be impractical) now somewhere in the US they've coaxed rat neurons to interface with electrodes and got them to perform simple stabilization of a simulated aircraft, I figure much the same technique could be used to attach the body's nerves to an electrode interface, it should be much easier than trying to interface with the brain directly.
Although... this will probably hurt, a lot.
If sensations are just electrical signals interpreted by the brain imagine what happens when you start blindly attaching things, the brain will adapt to the new input eventually but the time in between will probably be like setting your arm on fire and sticking it in a blender, for months on end.
Only the brave and the bold eh?