I got the cable furrel or whatever it's called. Though it fits fine it isn't long enough to take up the slack. I'd need two of them. Local hardware store didn't have anything, suggested I try a bicycle shop. I'm giving up on using the cable for now; I'll just continue my pushing it manually with my fingers method.
Over the last couple evenings I took the primary apart again (I think this may be the 4th time) and pulled the inner cover off. Replaced the inner shifter shaft seal and also the seal behind the clutch. Somebody was definitely in this thing f*cking it all up because the clutch seal was put in backwards and the gasket was facing the clutch...sealing nothing. The level of ineptitude of whoever touched this thing before me was astronomical. Bear in mind that while I'm a pretty decent car mechanic I've never dove into a bike to the level of this one and have still managed to fix it correctly -- most of the time.
The upside of doing this job multiple times is I can zip through it pretty quickly. I've also mastered a few shortcuts, one of which is this clever tool (named for a faux company of a friend of mine who is always engineering stuff like this).
This is a chunk of one of the bottles of vinegar I used to try to clean the fuel tank out. No more fussing about with feeler gauges!
Buttoned back together I no longer have ANY Type F leaking from the primary case. I also swear the thing runs better than before. I didn't detect any clutch slippage either.
I still have to attach my Hitchcock's muffler to replace the too-loud Emgo I'm currently using. The supplied bracket is too short. I picked up a length of similar steel at the hardware store yesterday and just have to bend it and drill a couple of holes.