Is there a portable / travel / pocket Dixit, without a large / bulky board but same riddling gameplay?
There are no official portable Dixit version I'm aware of, but to play the game you need only 3 things:


Set of cards with artwork
Way to secretly vote for cards for each player
Way to track score


Expansions are just a sets of cards, so choose one you like most. For secret voting you can make a set of tokens with different colored backs and numbered fronts, just like in base game. Or you can use dice and reveal them simultaneously. And for scoring you can use just pen and paper or any counters that go up to 30. You might need to make a box/container too, as I think expansion box is bigger than necessary. 
My friend did exactly this, although not for portability reasons, just because she liked set of cards from expansion the most, and it worked fine.