Well, I definitely think clitoral stimulation would be fine, since it seems like it's unlikely to introduce any new fluids into the vagina or to physically disturb cervical cells.

As for anal penetration, would you be using additional lube? If so, you might want to make extra sure that it doesn't enter the vagina -- but I really think that's a pretty far-fetched scenario anyway. (Just one of those "if lightning strikes the same tree twice where there's no one around to hear it, does it make a sound as it's charring" kind of things.)

So yeah, if it were me -- even considering really not wanting to do a second smear -- I'd go for it. ;)