#1
I know that baritones are tuned 2.5 steps down, but I've never seen one tuned 2 steps down. If I was to tune down to C, or occasionally dropped A#, would it be wiser to buy a baritone and tune up, or get an extended scale...or...whatever?

I just wanted to make sure I wasn't doing anything wrong to the neck.
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#3
I understand that, but what would be the quickest and easiest?
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#4
A baritone for A# definitely, you could probably manage C with it too but if i were you i'd feel a lot better about having a 6 string with just thicker strings tuned down to C.
"If you can do a half-assed job of anything, you're a one-eyed man in a kingdom of the blind."
-Kurt Vonnegut