I was thinking more along the lines of the clamps with levers shown in the below link.....
I realize they aren't for the M1, but one clamp on the M1 accessories page doesn't have an image or a sufficient description so I thought perhaps it might have a similar lever, or one would become available later.
But now my curiosity grows. Do those levers provide positive locking, such as having two positions - locked & unlocked? If you have an RRS lever clamp then you know what I mean, it "snaps" positively into a locked position. It occurred to me that the lever shown in the NN clamps may just be a rotary thumb screw with a handle and still need to be turned in the same manner, without actually "snapping" into a locked position.