Perhaps, but the beauty of humanity is it's relative randomness. Taking that away takes away a bit of their humanity. And still, if you replace something wholesale, you didn't 'fix' it at all.

Sadly, this is something I need to do. At least I should have some free time one finals are over.

Still, you shouldn't prevent yourself from being happy.

Yeah. We've chipped away at her defenses for quite a while. It'd be interesting to see if Shiroko can handle Ryuuko without developing a new personality. If so, then she'll have made some progress.