Thanks for all the information.
In the meantime, I've been looking at additional possibilities. Desmond offers a couple at a reasonable price:
http://www.bhphotovideo.com/c/produc...tilt_head.html
This could be coupled with a panoramic base or a leveling base. One could put the Manfrotto hexagonal plate adapter on top. Both the weight and the capacity are pretty attractive.
Or, in the Arca configuration: http://www.bhphotovideo.com/c/produc...tilt_head.html
I didn't want to include links to EBay. But, there's one there with a panning arca base on top that could work quite well with a leveler.
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