Technically, brazing brass is welding, since the parent metal and the filler
rod are the same. If you ever do get it up to temperature, you will be
creating a seam of brass on brass, fuzed, not wetted.

How about using Mapp gas. I have never used it, but I know it produces a
much higher flame temperature than propane. The next step after that is
Prestolite, which is air/acetylene--should be hot enough to melt brass.

But, I agree with the others. If you can get your hands on oxy/acetylene,
your troubles will be over.

Have you considered silver solder? It makes very strong joints on brass if
the fit-up is good.