The square knots in cave line securing your bolt snap will never loosen if you put a drop of Superglue on them after tightening. (Comparing their usage to climbing knots makes no sense because these are meant to be permanent attachments.)
This is the method I use as well. I have never had a bolt snap come loose in using this method for over a decade. I attach bolts snapped to light handles, camera handles, and my long hose this way.