Deathstrike cannot be a cyborg. Regenerative capabilities DO have a stopping point, after all.
When you've been under a lake for 8 months filled with at least a ton of the strongest metal on earth, your lungs will have surely gone out by then (considering the liquid came out of her tear ducts, which are connected to the nasal passage, it would've also gone into her lungs. meaning she has absolutely no room to breathe. instant death.), meaning no oxygen to your brain, meaning no life at all.
With that in consideration:
Noone knew yuriko in X2. Stryker had her as his own personal slave, and noone even got a bit upset that she had gone missing. So it's safe to say that since it's pretty obvious noone knew she was missing... noone knows she's a 1 ton paper weight sitting in an adamntium lab at the bottom of a lake. Which means that noone could possibly retrieve her, since they don't know she's there (and thus would have no reason to look for her), and could not, absolutely, positively, cannot make a cyborg out of her.
It's impossible. end of story.