If you're keeping everything in one scene and are just looking to move seamlessly between positions, using PosePresets works well for that. Just make sure you select the 'store root node' option on the PosePreset and you can load multiple character poses at the same time with a trigger. Of course, there's no animation or anything, but it is a seamless way to switch between, for example, a pair of people standing together to them being on the bed together without loading a new scene.
I'm not sure I fully understand what you mean by keeping appearance between scenes though...if you change scenes, I don't think there's any way for VAM to 'remember' the appearance you have loaded on one character and automatically apply it to another in the new scene.