AHC: Make the UDF remain a power

I've been reading up on French political history recently, and I have been interested in the collapse of the UDF in the late-80s early 90s. I understand the basic reasons for their inability to remain united and to find candidates for the national stage, so my challenge to you is to find a way to keep the UDF a force, and united, until today.
 
You'd have to get rid of Chirac in the mid-70s, before he has time to organize the RPR into an efficient and united political machine under his command. Then maybe Giscard can be re-elected in '81 and the UDF can be the main majority party (basically what the RPR was in OTL).
 
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