Another thing you could do would be to save out the object of your morphed v4, zero all the morphs and bring back in the morphed object you exported as a full body morph for v4, giving it a custom morph name. Then you'd only have 1 morph you'd need to copy over with the "copy morphs from" or WW. (which only recognizes full body morphs if I remember correctly).

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Consider me insane if you wish, but is your reality any better?