Hey Cheeky!
I havent tried it myself - but it sounds good in theory -
to reduce oxygen from Hot Head flame - wrap aluminum foil around the
holes near the base of the torch head - maybe a couple layers, so its strong enough to do the job without tearing.
Wrap it so you have a little extra - like a flap - to act as a handle to remove it or tighten it up what have you - and Id recomend using pliers to remove/tighten too - dont know how much heat the foil will hold - wouldnt wanna find out the hot way!!!
Happy experimenting!
Lavender