Keeping my build thread updated, here is the throttle method I used to get the Mikuni VM22 to work on the HS without knocking the carburetor way out to the side. Thanks to OND for the spiffy manifold. As always, this is in mock up phase, so take no note of fasteners, ugliness, or anything, anything at all, that my be wrong. What I lack in technical expertise, I make up for in posting verbosity.
Elbow from EC that I tried out on a Tilly for a kart. The end beneath the rubber grommet is threaded for the lock nut that holds it in place. I didn't use that, just shoved it in the hole, it fit snug, and I can pull vacuum on the seat there at the throttle cable. Spring holds it all together.