I have a bike trailer made out of 1-inch aluminum anodized tubing. It is basically a 3X3-foot square that has wheels attached. I'd like to build a vertical structure out of 3/4" emt that attaches to it. The perfect thing for me would be to have a T connector that is 3/4" on the long end and 1" on the short end. Since that isn't a thing yet, I am looking for other options. Any suggestions on a way to do that?

The end goal is a mobile artwork that includes several camera mount points.