The Burris XTB-Sako dovetail mounts look as if they still need tapping.
http://www.burrisoptics.co.uk/images/Bases_05.jpg
and so does the Roedale rail, which also seems to be held together by screws and friction.
Roedale Precision WebShop - Picatinny Rail fr Sako mit Optilock (0MOA) PR Sako (0MOA)
You'd think someone would make a rail that fits on by lock screw the same as a sako or leupold base. Or the base could be shaped like a picatinny rail on top instead of having a hole to twist and fit the ring into. Perhaps you could tap and screw (or weld) a piece of picatinny rail onto an optilock base ? Could be hard to get it straight. Cost would have to be no object
SAKO OPTILOCK Bases and rings
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