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I have stuff made like this custom all the time for machines and optics I design. It will be much cheaper to just buy several Ritchey clamps. Assuming you could design yourself, a one off would be about $ 300 to $ 500 in stainless. If you made 20 of them, price would be a lot less, maybe $ 100 each, but this would be a substantial investment. If you pay someone to also do the design, add another $ 300 to 500 for their time.
The fittings used for Sanitary (tri-clover) and Vacuum/Low Pressure (KF) are much bulkier than this fitting. They are usually made of castings, though machined ones do exist and would not really be suitable for joining a downtube.
You could possibly have an existing hinged or two bolt split shaft collar modified with the needed groove if you could find one in the correct ID, this might be more like a $ 150 job in a one off, but as one of the other posters pointed out fatigue is not really considered and the Ritchey part has a lot of material removed to save weight relative to standard shaft collars.
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