I just found out I have four ball head light stand adapters similar to that I can use. The bottom left might work the best.
Your handle idea looks good. I was at a hardware store and saw an interesting bolt, called a "hanger bolt". They come in a variety of sizes and styles but the I saw had 1/4x20 on one end and pointed screw thread on the other, like these:
I think this is what they're using to convert paint rollers extension handles into mic boom poles. You could take anything you wanted to use as a handle and screw one of those in the top of it.