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Propane torch, or better yet, MAPP gas torch, applied for 10 seconds more or less, on the head of the screw, that will generally soften the locktight enough to get the screw out. Once the screw is junked the options that leave a good bar end diminish significantly. If you're not worried about saving the bar end, use a 4" cutoff wheel like are often on sale at Harbor Freight for $10-15 to grind out the end of the bar end screw head. Just start making edge-wise cuts into the face of the screw. Once the screw head is gone the bar end will fall off, and you'll have the stump of the screw left sticking out the end of the bar. Hit that with the propane or MAPP torch until you see the locktite bubbling, then grab the stump with vice grips and unscrew it.
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