No. Once you change any verts, all morphs in the entire figure are broken. Putting it back doesn't help. At least I don't think it does, since it would have a different number and still change the vertex order.

You would need a script like PML or something similar. 

And, any modifications like that would be for personal use, you couldn't redistribute it without permission from SM, or without RTEncoder - which for me personally, I've never been able to get it to function. It crashed my PC when I tried using JoePublic's David3, for example. And I haven't bothered trying to figure out what the problem was. 

Sometimes, even RTEncoder isn't enough or allowed though. For example, HW3D doesn't allow it for Dawn. *Unless they've changed that rule recently. So you still have to get permission first.

 

~Shane