The idea is simple. I am a Florida Voter very reluctantly planning to vote for Trump on Election day. I see him as the lesser of two evils, but I respect there may be those who would disagree. Rather than get in to an argument about who is worse, if there is another Florida Voter reluctantly planning to vote for Biden, I would like to cancel out votes with one of you, where we each independently choose a third party candidate to vote for instead. If either of us change our minds (flip to the other side or wish to cast affirmatively for Trump/Biden, because of new information or other reasons) then we give the other person at least three days notice.
My offer was accepted elsewhere, so disregard.