Personally, I would stop to feed rather than, as Emma says, the hassle of pumping, sterilising etc. Even if you give ebm, you are going to have to stop to feed - bf will be easier. If you give a bottle of ebf - when will you be doing the pumping.
The first 6 weeks or so of feeding is crucial to the breastfeeding relationship and establishing your supply and pumping is not as effective as putting baby to the breast.
Also too, by essentially skipping an actual bf to give ebf etc you are possibly setting yourself up for more than just future supply issues, but potentially mastitis etc.
Have a great trip.
Alex