I use AnyPose, which allows me to rez up to nine (I think) pose stands for other avatars. I can then move and pose them all, as I please. There's a setting in Advanced (I think) which allows running multiple copies of the viewer simultaneously. Performance suffers, but that's to be expected and not an issue of you're just going for static poses.
And, for those who don't know, Maddy is one of my alts.