It would probably be okay, but my question would be ... why a single pygmy?
These are (in my opinion and experience) very social animals that thrive in groups and, in some ways, depend on each other.
Are you thinking of getting a single animal because you want to use this enclosure?
If you want to experience pygmy chameleons, you need to set them up properly:
18x18x24 exoterra or similar terrarium with 1.2 or 1.3
-Brad