I pulled that 'bubba' sight out of my junk box today and made a mounting screw for it. After some 'testing', I decided that one screw will hold it secure enough (so there is no movement and no need for the bracket that hooks into the Magazine Cut-Off hole).
I now have a 'one screw attachment' sight that is solid enough for Range Sessions and does not require removal of the Cut-Off.
Too soon old - Too late smart!