While the rules don't demand female crew members the weight requirements basically force you to have at least one. 6 People at 450 kg (990lbs) means you have an average of 75kg (165lbs). Given teams will need at least one ape on board say 90kg (200lbs), but more realistically closer to 100kg (220lbs) that leaves you with the 5 remaining crew at 70-72kg (154-158lbs), which is pretty small. Insert a 60 kg girl into the mix and the crew start to come back up to around 75kg each and having a small crew member who can duck off the hull to clean something else of check traffic to leward is always helpful.

If I was recruiting I'd look for the following. (from back to front)

Skipper-> proven high performance cat sailer.
Wing Trim -> Skippers normal crew
Tactition -> Female with big fleet and/or match racing history. I'd be looking at people who have been training / trailing for womens match racing at the olympics.
Jib/kite trim -> someone with wide experiance including boats up to 50'
Misc (Ape/grinder/mast/fd2/pit/etc) -> Agility and strength are key here. In Australia I'd be looking for a skiff sailer who also sails regularly on keel boats.
Foredeck. Cat and dinghy sailing is irrelevant you want someone who is agile, strong and can see in advance what is happening. You want someone who is used to doing all the work forward of the mast so if the mainly sail on 50+ boats they are the wrong guy. Think Melges 32 or Farr 40 decky.