If it were me, I'd make the diamond a little shorter so that there will be some clearance between the dots and the bevels at the ends of the arms and the edge of the tie block ( see adjusted photo). I really think it would look better, especially at the ends of the arms where the bevels appear to meet the inlays. The bridge arms will need to be brought down to thickness (about 3mm) and left flat. You can route the receptacles for the dots on a drill press using a mill bit, a fence and stops. Use 1/4" dots and a 1/4" bit. The diamonds can be routed with a Dremel and an inlay base. I don't think you can get a jig in there so you may have to do it free hand and finish with knives and chisels.
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