I agree. I would wait until you can commit to pumping, but with a surrogacy situation, I would also try to start pumping ahead if you can. In adoption, I think it is harder to pump ahead because there is a chance the birthmother may change her mind, but in your situation, it is your baby, so I would try to get my supply started before the baby arrives. So I think I would try to start pumping as soon as your vacation is done and bring the pump on the plane with you (even if it is a hand pump) when you travel to get the baby.
Good luck!
Jennifer