I have you tried Poser Copy morphs? A4 is a morph for Victoria 4. I use the Copy Morph for Aiko4, Girl4 and the She Freak body morphs.

Yup - use it all the time! Best thing since sliced bread, as it allows an A4 to wear (most) V4-only items. But that doesn't solve the flexing hips or thigh problem. The clothing doesn't follow the pose as accurately as G2F. (I did try the fitting room a few times back in PP2012, but it was generally more work that just the post-work: first render, allow poke-thru, second partial render with A4 invisible, to get the clothing item complete. I'm sure they spent a lot of time on the fitting room, but still, what is fastest? Most predictable?