There is a new product out from Greenbriar available at that bastion of effective equipment called DAZ that allows you to do exactly this. The ToolBox set -- and the Poser version is effective enough -- allows you to essentially rig & morph a figure (make one, even, apparently) completely, then export it as a Poser file directly (no importing into Poser), including joint parameters and other fashionable joys. It even includes a set up that create inj and rem settings automatically, including the file formats, that are either set up for their own channels or that use one of the preexisting ones. Basically, it is exactly what has long been asked for in regards to morphing.