From my experience, any cigar-type jet lighter will do the job. You just need something hotter than a lighter and a torch definitely gets the job done. Keep in mind you don't need anything very big. The ones in the links look fine. The advice above should be taken very seriously, you don't wanna set your house on fire!
As for the Dremel heat gun, I have an Embur which seems very similar. It appeared these are both glorified soldering irons. The embur does not get hot enough to vaporize any substances I have tried unless you touch the red-hot tip directly to the material. (The temperature of the tip is clearly hot enough but the heat it emits is not) However, I am assuming this would also burn a good amount of extract. Because of this I do not use it for this sort of thing but it could potentially work.
Would love to hear more about butane-less lighters though. I love my Embur for smoking other things and think a cleaner hit could be smoother, healthier and possibly tastier.
