Well, presumably it should work about the same for most any mortal creature; with a few tweaks and such. Orcs, dwarves, humans, heartheans, etc are all put together pretty similarly. Elves are stuck together differently (see library), so that would probably be much trickier.
He would have to learn to do that. I presume that since he plans to rebuild the Doompire he will want to be making more D’Orcs. No reason he couldn’t do that for others that wanted it. The only problem I see is how long it takes to figure this out. Humans don’t live that long, even assuming that a giant war wasn’t about to sneak up and clobber everyone. So he’s probably only got four or five decades to figure it out for Vaselle.
Of course this is just the assumption I am working on. We shall have to see how serious he is about the “Restoration” as the D’Orcs and Orcs are calling it. I have a suspicion not all parties agree on what a Restoration of the Doompire actually means.