As only as the AIO is still snug around the legs. I could see that being hard to do unless you size up the AIO. What about a fitted then a insert then a PUL cover? I think AIO generally still only absorb the same as a standard larger insert (like a BG OS MF) so that might work fine and be easier to attach.
Mom to LO#1 born 1/7/2010; Cloth diapered since day 1; Part-time EC since 9 months; Daytime PL since 29 months & LO#2 born 12/1/2013; first diaper was a tiny Swaddlebees Newborn Fitted! Checkout my absorbency tests.
Thoughts on Yeast
and a newer one here