Good Evening,
I know this is an older thread, but I registered on this board to reply to this topic...
I have three jockey shifters for my '04 Custom that I use, and I generally switch them out once a month. One is a LaBriola kit, the second is an old Hurst shift lever with a classic 4-speed shift ball I found in my junk pile which I can mount directly to the shifter shaft, and the third is a police style tank shifter with linkage that I pulled together using parts from various sources (eBay, vintage catalog, indie shop and my local Ace Hardware store.) I took a 6600 mile "Lap of America" road trip on my bike this summer with a passenger, and had no issues with accidentally knocking the lever or anything.
Currently I am in the process of assembling parts to construct a jockey shifter that will sit on the right side of the bike toward the back of the fuel tank similar to a shifter I once saw on an old Indian dirt bike; this will require that I weld a pass-through tube or a long bushing to the frame by the oil tank to allow a long shifter "transfer shaft" to pass from right to left.
The foot clutch I use is a LaBriola with a vintage hot rod brake pedal pad mounted on it. Keep in mind that the LaBroila clutch pedal requires a forward control; however, there are several Sporty owners on another board who have come up with creative solutions and fabricated foot clutches on a mid-control bike. IMO if you're going to do a jockey shift, do it right with a foot clutch, and not the method used on the Widowmaker shifter linked in the post above.