Assuming a "smart pose" is possible, the user will first need to load the prop, remember that a smart pose is available for it, search and find that pose, then apply it. If you create a separate smart prop for each figure referencing the same external geometry the user will see immediatly which one to load and it will work without extra adjustment. That is the route I would choose.

Its a bit like having a MAT pose to change one material colour. Sometimes the labour saving device creates more work :)