Your idea seems to be to attach something to the tube it self, sorry if I misunderstood the photo.
When I deforked my C8 I had no problems getting the radius blocks and bars from Losmandy to fit the existing screw holes in the front rim and back plate. I just got mine from Bintel but I think there are other brands to do the same.
I would avoid attaching anything to the actual tube as I think you would get flexing problems.
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