Despite all the reports that QR would not interline luggage on two tickets, checking in at BKK on Monday night for BKK/DOH/CDG in J and F followed by an Air France flight in J, I asked nicely and there was no hesitation - the check in lady said "of course".
Didn't help me much though. Despite having 5 hours at CDG to transfer the bag from T1 to T2, it was not loaded on the AF flight.