i have the same bike and had the same problem. trying to get it out i just stripped the bolt.
solution is to get a big drill bit, maybe half inch then drill it out. just take off the top part, once thats off the long part will screw right out. then go to riders choice or some other bike store that sells suzuki and get new bolts.
Do you mean drill in until the head of the bolt pops off, remove the bar end and unscrew the rest of the bolt (with I assume a pair of vise grips)?
I think he is suggesting to drill the head out...
I would first try heat + extractor bit...though...
thats right, when i did i did not scratch the paint or anyting, came off very easily. i did not have a heat gun or an extractor kit.
I still think heating would've been the smarter choice, but congrats!