Ellen ~
It would be good for you to begin Transitioning to the Modified Plan NOW - Yep!
It may slightly slow down your weight loss for a few days while your body becomes adjusted to the increase in sodium. Just be sure to drink that water, Girlfriend!
Keep your meat portions to just a few ounces initially then increase up to 4-5 ounces. Watch the salad dressing. I often use just vinegar. When I go to a restaurant I request Vinegar and oil and then just use the vinegar or else ask for lemon slices. It is just fine and for the first time in my life, I actually know what Romaine and Ice Berg lettuce taste like! I used to smother my salad in Ranch dressing or Roquefort!
I am concerned about you waiting until just before you leave for your trip.
You could have a blow out on the plane or in Frankfurt. Gosh, that could be REALLY gnarly to have to do the diarrhea dash in Europe - they have pay toilets! NOT a pretty picture, is it?
Start now, eat lean meat and veggies. On the shake only plan, people may still have a small salad - it is not considered cheating to do so that is, UNLESS you have blue cheese, croutons, bacon bits, strips of Swiss and cheddar and a half pound of chicken or turkey flopped upon the top of the salad.
Stay away from cob salads! Back Away! Beep! Beep! Back Away. Be afraid. Be Ver-ry afraid