I've been thinking about some sort of way to secure the cover too and seeing this just made me think about a way. I have a vortex venom And the way it mounts to my picarinny rail there is a knob on the right side of the base that tightens the base down to the picatinny. If I could get a piece of elastic string, kinda like a woman's pony tail holder, and put a whole in the left side of the cover, the side where the up/down buttons are on the venom, then double over the string and have the two ends flattened inside the cover and running out of the side of the cover to underneath the gun and the loop end of string, loop formed by doubling the elastic string over, and the loop end hook onto the "tightening bolt" on the right side of the venom base. Don't know if this would want to pull the cover off the side or not, just a thought.
Basically the same way as this just move your point of where the string comes out to the side and hook it on the base of the venom. Thanks for speaking this idea in my head bc I too worry about losing my cover and have been trying to come up with a good way to secure it