I didn't pay a whole lot for it since it has a clutch starting to slip that the PO didn't want to deal with ...
1 - Is it possible to support the rear of it with a sawhorse like I do with my older Ks to get the center stand and transmission off?
2 - Are the final drive pivot bearings "decent" or should I plan on replacing those? (Most of the time the cheap plastic bearing races on the earlier paralever Ks fall apart when you take the final drive off.)
Must be a very short saw horse. I clamp the front wheel down and use a bottle jack under the tranny when I've done the rear drive unit. That's twice now, btw. I think that's the weakest link in this drivetrain. To disassemble as far forward as the tranny, I'd have to put the bottle jack under the engine and as far aft as possible to avoid getting too far ahead of the center of gravity (COG). The COG is only a concern until I get the rear wheel and final drive off.
When you get it all apart, you might consider replacing the clutch slave. You don't want to have to do it all again. Mine's down right now for that very problem with a worn out slave unit, although at 87K, it's never failed me before. Neither has the clutch disc itself for that matter, and as far as I can tell, the clutch is still strong. I'm not sure if I'll pull the tranny and look at it when I do the slave unit, but I'll see when I get there. I may just do that if only to lube the splines.
As with the clutch, I've never had any problems with the pivot bearings. As long as the bike keeps handing great, I won't consider replacing them. Just keep them properly adjusted - very important.
For perspective on my bike, 82K of the 87K are mine. So I'm pretty confident that the clutch disc, slave unit, and pivot bearings are still the originals.
Also for perspective, I had 114K on my old '85 K100RS, and never had to replace a clutch. Bought one once, but never had to install it. I think your failure at only 30K is very premature and I'd be concerned about previous owner abuse.