Have you chance to examine an Ex Israili modified SUIT Sight?

They fitted a Looped ended coiled spring Underneath the front body section.
& in addition, drilled through the locking catch & drilled & tapped into the alloy body.
This took a BA screw, which when fitted. Made the sight very stable to use shooting.

Of course, you lost the instantly removeable feature with the screw in place.
But, it is a very simple matter to remove the screw, lift the catch & lift off the sight from a top cover!