I'll vote for which ever candidate is most likely to keep this bunch of Mcarthyist, gynephobic lunatics out of power.
Since all the parties are like this (except UKIP, and I am never ever voting UKIP as they are a bunch of racist, misogynist, useless bastards), then possibly the way to go is to indeed vote on a candidate-by-candidate basis.
Eg I could never vote for Corbyn, but I am intending to vote for my local Labour MP, because he's been pretty sensible on this issue. (And a lot of the Parliamentary Labour Party absolutely hate Corbyn, too, which is reassuring on an individual level even it it's not a fucking bit of help at party level.)
Same with the Tories, the Greens, the LibDems, the SNP - all of the parties have signed up to this shit, but the individual candidates might be OK.
(Disclaimer: I don't think I could ever vote Tory, however nice the candidate, because of everything else they do, but I'd hold my nose and vote for a gender-crit Green, SNP or LibDem, I think.)