How about making a wooden platform that attaches to the camera. It can be held to the bottom of the camera rails by many means, then add squared detents to the bottom of the platform which fit 1/2 a rod's depth to discourage quick motion and movement while in position.
(Your camera could use such a platform in any event. Perhaps add a couple of tripod holes four future use using T-nuts from the camera side, top of plate.)
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