You would need to measure the brass hardness to see the variability. In my opinion, you don't know what you have until you test it. Tempilaq doesn't insure the brass is annealed or over annealed, all you know is that it reached a minimum temp. It could have reached that temp from the brass substrate or it could have reached that temp because of 2500 degree torch flame blow-by striking the paint.
All that said, there are thousands of reloaders using a torch with no idea if they actually have annealed brass but they're happy as clams so ....
If you can show your results I think it has merit but I'm not sure the juice is worth the squeeze. Setup, run, box, and ship for 20 to 50 cents each isn't much money for the hassle.