Just tried the burner out in an old forge shell. Extremely stable flame at least for the 15 minutes of run time my near dead empty 20 pounder afforded. I will go pull the spare off the camper later and post pictures or a short video.
Flame was a little reducing which I suppose could be addressed by modifying the reil type burner's air intake size.
The flame was perfectly stable and very quiet over a wide range as well.
I wish I had the time to change out my production slot forge from blown to n.a.
Thanks again for sharing your discoveries.