I sometimes like working with my Lumedyne in concert with speed lights. In fact all my location work is now Speed Lights, Lumedyne, and a first release of the Elinchrom Ranger. This mounting idea came about when I was wanting a specular highlight right in the center of a FourSquare box that was a point source, with no diffusion on the box
After some tinkering, this is what I came up with. I am showing you that either of the two styles of Lumedyne heads can be mounted the same way, just a little different on how I drilled out the bar. A single head in a FourSquare is a great light when you need more than what a speed light can deliver. Let me know if this helps you out and we could make some up for you.