So I was persuaded by the sight of the falafel bowl being made for the chap in front of me to go for that, with guacamole, of course. And you still get the pita, just on the side.
In hindsight, I think I prefer it all jammed into a pita and eaten like a sandwich, seems to bring everything together better and avoids one having to shovel the stuff together that you want to eat together.
Live and learn, I suppose.