I've settled on a slight variation of the candle method. I made an alcohol burner that doesn't produce soot so you can see the color change as you're annealing.
It's similar to this ...
The heat is not as intense as a propane torch, it gradually heats the cases just like a candle, and it does produce a Lapua like discoloration.
FWIW, I know JB has tested the candle method and it does anneal cases properly.