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@jetski
ed: That's interesting and similar to my idea above, but I would not trust a normal quill mechanism as much as a starnut, as the starnut concept is based on getting stronger when pulled, while the quill force stays the same.
What is good about this idea is that the quill reaches so deep into the steerer, and that you keep the strong connection between caliper and quill. But few people will have such a long steerer that you can fit a quill from top and bottom at the same time (and the clearance issue is not resolved here, of course).
In my design, both of these issues can be improved by choosing a thicker piece of metal, for example 60 x 20 x 8, and the thickness of 8mm filed down by 6mm to have 2mm at the slots, and using two double starnuts in a row with a long bolt. This way, the piece will sit deeper in the steerer tube and also 'lean' on the steerer tube at the outside. And, the calipers will have a 8mm deep hole + nut to sit in.