That's all I did, placed the head in a zip lock freezer bag and boiled it for a few minutes. I removed it from the bag (head was totally dry) and placed it in my padded vice. The head was a little too hot to handle without gloves, but not hot enough to melt the padding on the vice jaws. The bezel twisted off easily, but felt like there was peanut butter in the threads. After it was all apart, I cleaned off the black thread blocker crud that was all balled up. I put it back together without any thread locker because I want to be able to open it again later. Once I settle on a drop in, I'll probably put thread locker on the two that are weapon light heads. I didn't actually try to remove the bezel before heating, and after doing the third head, I realized I should have tried it without heating just to see. But there was thread locker in all three of the heads I have.
Hope that helps!