Admiral:
There might be loose arms and such things, too, good idea! (Though loaded with the peril of having to conform well to existing plastic miniatures quite at the millimetre, which I’m still quite scattered inaccurate about despite frequent control measurements.)
But the 6 full body slaves will take priority. Dead set about it. Full detailed resin/metal miniatures hold so much more detail than plastic ones, so any conversion bits for plastic kits will be add-ons to the Orc slave mini-range, and customers might well be force-fed a blister of full-body slaves with any bitz kits for the aforementioned reason. Also, the 6 orc bodies will in themselves be slightly versatile, I imagine. Head swaps will go a way to add variety, and simple weapon swaps will take them even longer. Plus their oppressed poses and scars will convey the slave image much more than any currently available plastic kits will. But yes, conversion bits will allow everyone to add even more variety to their rabble hordes, which is good.
And there will be Hobgobbo slavedrivers, no worries. 