Too many risks with flame and heat. You probably still need to invest in a pair of stout real leather gloves to protect yourself. Plus a respirator for the fumes.

For the frames I have stripped, I have always used paint stripper. Yeah, a bit more work, and there are still fumes to consider, but I would rather take the extra time than spend it in hospital with respiratory issues from burnt paint.

There are places that dip strip larger items such as window frames and furniture. I don't know if they exist around you, but it might be worth considering. You do have to ensure the inside of the frame is well washed out.