If you particularly wish to shop for bags in Paris rather than the UK (from a price perspective that is not unreasonable and just think of the differential for the poor Americans!) the global 2 bags (B, K, C?) per semester rule won't make any difference to you. You have implied that if you bought two bags in Paris you would rather not buy more in the UK because they would cost more. So what is the problem? At one time if you were lucky, shopping on different continents could increase the number you might get per year - even at only two per year you must soon get to the limit of what you might require.
If you are already being offered bags in Paris you are over that hurdle.
Yes thank you! One must not be so greedy!
The Constance isn't part of the Quota. Only Birkin and Kelly. Constance and Kelly cuts/pochettes are part of the "other leather quota".