I have in the past unbolted the regulator, taken it out of the vehicle and drilled out the 10, stinks but what other choice do you have if you break it your taking the regulator out of the car anyway...

The only thing that softens lock-tite is heat. A soldering iron sounds like the way to do this as it will heat the head of the bolt and then the threads and not transfer too much heat to the plastic. I would treat them as if they were all had lock-tite on them

If you are in the shop and you have a water cooler with a "hot" water setting... I have a funnel with a piece of tubing on the end. The hot water is close to 180 degrees. Usually enough to melt the locktite. Usually also works on wipers arms/nuts, those little bolts on an Astro Van side window, the window slider bolt in older 2 door Acuras and Accords, and the other day instead of breaking the mirror on an FW2074, I took three minutes to take the dome light out of the headliner, unplug, cut out the glass, lay it on the stand, pour hot water on it. Unscrew it easily.