Other than VS and BA, which other flights are leaving at around that time? AF leaves at 3PM, and the Asian and Australia flights are mostly around midnight. AS is now over at T2.
Still some Alaska flights on A-term and don't forget jetBlue has up to 30ish flights per day in the summer. I am not so worried that the TSA lines will be long often for the ORY-SFO-PPT flight(if all goes well I wouldn't expect more than 20 mins), but the 2345 departure time is a busy, busy time to go thru TSA on A-term. For the return flight, customs and re-check could be hectic knowing how these things go.
Picking a Monday in July, here are flights that may affect the customs times when French Bee gets in:
BA A380 1715 (often an hour late or so)
AF 77W 1830
CX 359 1715 (frequently 1 hour early or 1 hour late)
PR 343 1900(arrives 1800-1830 often)
CZ 77W 1930 (arrives 1830 often)
Cutting it a wee bit close if the bags have to make it back onto the jet IMO. Again, wishing them all the best and hope French Bee expands.