The thread locker would need only a small amount of heat to melt and release. Just heat the head of the bolt, a propane torch would be enough heat. I use that method all the time at work on things like brake caliper bracket bolt that are factory loc-tited. There is one form of locker that requires heat to remove.
BTW, heating the head of the bolt works even if it doesn't have Loc-Tite. It expands the end of the bolt just enough to break the friction between the bolt head and part. Honda crank balancer bolts are an example. They always seem to be welded in place, but 30 seconds with an oxy-acetelene torch and it spins right out.