Technically, you don't need a data plan if only Google maps is wanted. You can download all your maps on your phone, with airplane mode on. Otherwise, depending how long you want to be there for, you can get Orange at CDG, where they will set it up for you. If 2 weeks is too short a plan, SFR has 30 day PAYG sim plans. I am pretty sure they are not at CDG and you would need to go one of their offices. They like appointments.
You really don't require unlimited data, but if that is what you want, I am not sure Orange offers it. I went to London for a few weeks and never turned data off, used Google constantly (bus schedules etc) and I never got close to using up all the data they gave me.
Why do you require another phone? You just remove your own sim in any smartalec phone and you can't accidentally use North American data while in Europe. This is the nice thing about Orange at the airport. Everything done properly in no time flat, with minimal time wasted.
Now, for calling home, Google duo works over wi-fi - no phone time needed. Most NA phone companies also allow WiFi calling TO home base and within France, using your own number from home. You can use the airport WiFi (wee fee to the French) for nothing.
So it is a complicated state of affairs, so I take notes and make columns for all the possibilities for the least cost.
In France tho, Orange, because it just works. But make sure you end up near one of their shops (which are all over the place) at the end of two weeks, because Europeans don't like North American credit cards online.