Sometimes,

You can talk to flight attendants to help you in your dilemma.

They can take special measures to help you get to the other side faster, maybe carting, giving special access at customs, even holding up the flight for just a few extra minutes.

But that's if the plane into CDG happens without ANY hitch. One setback could spell disaster for you!

Happened to me a few years ago on pit stop in Vancouver from a trip from YUL to HKG.