Don't use heat.

Just get some 5/32" Music wire and bend it to shape.

The way I do it is:

Clamp it in a vise between 2 pieces of 1/8" plywood so that the plywood is just above the vise jaws (About 1/16" )

Then bend the wire whilst banging the hell out of it with a hammer.

Sometimes you can't get it exactly 90 degrees because it hits the top of the vise, so once you get to that point, just pull it out of the vise a little more and whack it some more.