After much searching in my shop, I think I found an excellent solution for my cabinet door handles. I found a 20mm Beta socket wrench buried in one of my cabinets. I was lucky to find it's twin on Amazon for only $5. When installed this should make a unique door handle.

I will epoxy a M20 x 80mm bolt to the upper part of the wrench and install using fender washers to distribute the weight across the door.