That's a bridge you can cross when you get closer to it. You will, at the very least, be very into the swing of this whole thing and know what your plan ahead is. Work out your 14 weeks abstinence and where it is in relation to your holiday.
The short answer is yes you can do it away, many do and succeeded. As you will be a long way down the road, and probably 3 stone lighter, you could possibly switch to the Lite and not do too much damage but it all depends on your own mind set at the time. Your LLC should be able to advise more.