I used to commute with a Chameleon on the train - never found it much of a problem size wise - was only a few inches bigger than a Birdy.
True, it is a bit of pain having to take the wheel out, but dirt-wise the Birdy was worse, always got messy when folding the fork.
The gizmos that clip the Joey all together look nice, I just used an old toe strap and it did the same job of holding it in a single manageable package.