The 30mm Mikuni bolts to an intake tube (of whichever style). I don't think you'd be successful without at least an insulator. This intake is free to ship to me, and I could always post it to you, if you wish. perhaps that would save a bit.
http://www.ebay.com/itm/30MM-MANIFOL...fb51b8&vxp=mtr
Bogieboy has experience with hydraulic clutches, so I recommend that you seek him out.
Different CDI's will have not only dissimilar amounts of advance, but also different rates. Humanbeing is our resident expert.
That's cool that you found 18 tooth sprockets. I wonder if you'll have clearance problems.