I could make an extended stem tube on the base and make the stem height adjustable from say six to ten inches.
I was fixing to mention this, it's how I did my old "A" forty years ago and it still suits me. I like ~8" because my base always collects stuff and the height leaves room for the big clumsy paws to work and for the bobbin to hang.
The the fluted/filigreed tube could thread into the base so that all could fit flat in the case of heavy leather with ivory fittings.
You might blue the damascus with acid fumes in cabinet to take the glare off, not sure how that would look, but it could be nicer.
It sure is going to be an investment, I suspect you might make some parts more than once.
Charlie, Mark said in the OP that he was using "Law style jaws". I think he has what was a TRV to work from.