Brining back this topic. I naively believed that France had taken a licence from the USN and used Essex or Midway catapults, but I was wrong. (the Charles de Gaulle actually has American catapults 75 m in length, hence shortened Nimitz catapults which are 90 m long)
I've just discovered (to my amazement) that France took a licence from British steam catapults for Foch and Clemenceau. Those catapults were BS-5A similar to Ark Royal and Eagle refit in the 60's. Which meant that all four British and French carriers had similar catapults. Not bad for inter-operability.
http://warships1discussionboards.yuku.com/topic/22160/British-Catapult-questions?page=#.WAT8TCQwAaI
My take for Anglo-French carriers is to start from the similar catapults, then similar interceptors.
France used the mostly obsolote Crusader while RN spey-ized Phantoms.
So how about this ?
http://www.secretprojects.co.uk/forum/index.php/topic,1406.msg12259.html#msg12259
In the early 60's SNECMA needed to learn about turbofans to replace their ATAR and took a TF-30 lience. The (crappy) TF-30 powered a host of Dassault prototypes but the indigenous M-53 was prefered in the end.
The Spey would have been much better, and it was actually builf for Allison as the A-7's TF-41.
A Two-sader powered by a French TF-41 and with A-7 subsystems to cut costs might be a winner. The aircraft would be build by Shorts in GB and Aerospatiale in France (OTL Aerospatiale did try to licence-build A-7s in 1972 but Dassault Super Etendard prevailed). The Jaguar would be probably dead (not a great loss).