Although I don't know how solo wizards do in a4 and vs azmo, might want to check those out.
Honestly, Azmo has always been basically cake as a blizz/hydra wiz whenever I've been able to get to him. Although I've never done him in inferno, he moves so little that you just drop a hydra near him, put a blizzard on him, avoid the fireball and his pools and kill the mob spawning thing when it comes out, and the hydra poison pools stack to insane amounts (kind of like phase III belial) and he just drops like a rock. So I figure if I could have gotten to the point where I could reliably kill elite phasebeasts without too much kiting he'd probably have been doable (although maybe not "easy" like in earlier difficulties).
Cydea's kind of the same thing - just drop blizz on her adds. But again, never done inferno.
And yeah, keywarden was scary (at least partly because of all the posts about him) but doable. I'd remake if he were by the entrance (why risk it?) but I can kill him once I clear enough to have a fair amount of kiting room. When I fought him the lowest I got was a little under half and I could have let regen cover that but popped a pot to be safe. Ghom went down pretty quick.
I've only ever seen one wizard solo clear thread. I'm sure there's been more that have done it, but there were various posts I've seen where people thought they'd need a group to get there and/or that wizards weren't solo viable past AI/AII-ish (possibly excepting the CM permafreeze builds). Yet there were also wizards farming AIII. I dunno, I was going to go for it, I figure you can't know if *you* can do it if you don't try. Oh well. :)