Hhmmm so changing the voting system and reversing the biggest democratic vote in UK history without any national vote on the matter, and you think that'll wash? LOL
I dont think they will ask for Brexit to be revoked. I do think that a second referendum would be a key policy position for Lib Dems. I do think they will relinquish that for Electoral Change (without a referendum) as an agreement for support of a Labour led government. I dont think Labour will get enough to lead a government with the SNP, who obviously will demand an Independence Referendum.
The Tory's best bet would be to allow Labour get a majority with a poor leader who has absolutely no idea to correct the path the UK is going down. Of course, DUP support will vanish even further in the North as well.
Best of luck with the rest of your nonsense.