nice drawing, but you guys are way to complicating it, on the m7 you can do it with just a couple washers and a longer bolt.
on the m8 its a little more complicated.
ok lets call the brown piece the belt tension adjuster, you remove that, machine a hole in it 3/4 in diamiter, you make a new stepped washer that is .700 in diamiter with a 1/4" step, then counter sink the front of the stepped washer for the bolt to go through, now the sepped washer goes inside the belt adjuster and the bolt tighens the washer to the dimond drive spines leaving a 1/4 gap to the 3/4 whole you drilled in the adjuster, not the clutch is no longer being bolted down tight.
if I wasnt on my phone I would draw it up for you.
Better Idea, I will just make a few.