Did anyone ever escape Nazi Germany through KdF trips?
score:7
Accepted answer
I think you are thinking about this from the wrong angle. Answering a question of the 'did anyone ever' format would require finding one example, and could you tell a dissident from a drunk who missed departure?
The problem for many German Jews (and also for some political dissidents) was to find a place that would let them in. The MS St. Louis is well-known example.
Germany allowed some emigration of Jews, as long as they left most of their money in Germany. Somebody who wanted to flee covertly would be unable to sell his or her assets before, with the same result. The policy of expulsion became a policy of extermination later on.
Many KdF activities were a 'reward' for regime loyalists. A simple worker might hope for a few days at the Baltic coast, maybe.