My personal choice would be to keep it as close to original as possible.
the Brembo race calipers use a 40mm mount, so i'd use these. I don't like the adaptor brackets...............
I'd go for a radial master cylinder though. Doesn't look out of place. I'd use a small race reservoir mounted on the yoke for that "different" look just make it look like "somethings" been done
