I've got Drag Bars, Buck Horns, and Clip-on's.
I can switch them in about 20-30 minutes, with NO changes to the stock cables, throttle, or grips.
(but to make it quick, I do have a stock left hand grip permanently installed on all three bars, as well as the risers permanently attached to the Buck Horns/Drag Bars, so there's only the two 14mm nuts under the tree to do.)
Haven't tried Mini-Apes yet though, and they COULD present a problem. I don't know.