[glend (Glen)]

There are plenty of nylon tube clamps that could be used to clamp a tripod platorm onto the counterweight tube. Just wander through the Whitworths website or catalogue until you find the one you want. It would be pretty easy to construct a tripod foot out of carbon fibre sheet and attach to the tube clamp with a bolt.
There are also heaps of clamping devices to attach cameras and gos units to bike handlebars, many if this could work.
Of course being that this is going to sit on a scope it no doubt has to be machined from a solid billet and then anodised to match the focuser colour scheme - people make this stuff to hard and to expensive.