Okay I was asked to do this, so here you have it.

One piece:

Nami

Robin (Definitely)

Hancock (Definitely)

Shirohoshi (Maybe. I want to but I don''t know how to go about it)

Rebecca (Possibly, but unlikely)

Viola (With Rebecca)

Reiju (Maybe, but right now I can only think of repeating the set up used with Nami, so I''m open to suggestions.)