Disclaimer. I don't know the exact wording so this Idea may or may not work.
If I understand correctly the adjustment lever must be disabled or rendered unfunctional?
My solution
#1 remove stock using supplied mapul tool
#2 install blocking strips leaving desired hole accessable.

I used derlin strips but anything hardwoods will work, I used double stick tape to hold it to the buffer tube.
#3reinstall stock using magpull supplied tool,
Stock will only lock into available hole & not be adjustable.Friction lock still works
Stock will still be removable and strips can be removed if moving to a local without silly rules.
filler strips must flush out with buffer tube to render lever unoperable.

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