I don't think I achieved it but the closest I would have gone would have been:
22 Rydalmere, waaay back 10 years ago under Roger, gave it a really good shake (I saw at least 20 girls there)
And Saigon Princess, at one stage I think there was only 1 girl on their then current roster who I hadn't seen.
There might be others I can't think of right now. Definitely harder to do these days now that a lot more shops only have girls work 1 day a week.