Ah, Giscard... until the very end, France very own Jimmy Carter. There are some interesting parallels between the two, although I often thought Jimmy was more sympathetic than Giscard.
And Chirac, damn it. Do you want a POD for Giscard to win ? For a start, don't make Chirac his PM in 1974-76. These two hated each others, until the very end. Giscard methodically humiliated Chirac and his wife, sometimes very cruelly. Chirac slammed the door in August 1976, created the RPR in december, took Paris mayorship in March 1977, and methodically started his political ascent from there.
(when Chirac died in 2019, I told my wife "Look, Giscard has outlived the man he hated so much for 38 years. He won't last long." Well he lasted only 15 months.
Also when Giscard went to Chirac burial and the ceremony didn't started in time, Giscard couldn't help saying aloud "typical Chirac, always late !" LMAO )
Truth be told, even without Chirac and much like poor Carter, Giscard dug his own graveyard alone.
He went dining with French families (no kidding), played accordion and football (ROTFL) to try and look more popular. he was just ridiculous, Dukakis-in-a-tank style, unfortunately.
Much more damaging, obviously, were Bokassa's diamonds and jewels. That was Giscard very own "Egale claw moment" where he lost touch with his electorate.
As political Tsar bomba, really.
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