This is so exciting, pinkish!
I would try to order rose indienne + cocoan. (one rare colour and one easier to get colour.
PS: I had the choice of black or cocoan and I chose black only because I hadn't a black bag. If I've a non-exotic black birkin already, I am quite sure I would gravitate to choosing cocoan.
Do you know if the store manager will try her best to get you the colours you want? If she is nice, she will order ALL 4 colours, and see which one comes first!