This plan B is a very important thing to think through right now. As I see it, if the vote opponent isn't the right one for us, the choices are:
1) Build the UN slooooooowly in a city that we can gift to Sally.
* Reminder: if he has 3 or less cities, has culture on the city tile or has owned it at some point, he will accept any city. Otherwise he can't be in financial trouble & city must be within plotDist 9 of an existing city of his.
* Number of tricks that we can use to alleviate the build time, as noted earlier, stacking prod modifiers and abuse whip overflow a LOT. Kremlin would help a LOT, reducing the rush cost of a 1hammer UN from 18k to 12k.
* I need to double-check, but we might be able to leapfrog-citygift any city to him (gift a city, which opens the option to gift more cities etc), as long as all the distances between the leapfrog cities are <9. Need to be reaaaally careful with this of course, since if we gift him 3-5 cities (one of which'd be our best prod city) and fail to instantly win (say, if he gets into financial trouble midway, or we aren't #1 in pop anymore), we're SCREWED.

I forget, is our pop lead so solid that there's no danger of dropping to #2?
2) Go bonk some heads to change the pop order.
* Hard-ish on any grand scale, since our military techs suck. Seriously, just Maces and no siege?
3) Instigate head-bonking to change the pop order.
* If it works, by far the best option. Do we need either of Toku/Sally votes? If not, it might not be such a bad thing if Toku takes a big chunk out of Sally and capitulates him. Of course he can't capitulate him too early so he actually gets a lot more pop. After all, vassal pop doesn't count towards who the other vote candidate is.
* Does Toku even have Feudalism yet? If not, obviously he can't capitulate anyone yet...