To a degree, yes. But when she actually sided with the Bilusaludos (at least in principle), I found myself getting intrigued by the character.
I would kinda hope they do, if only because I don't like the notion that basically everything was lost because Haruo was a moron. I mean, if he'd let the two assimilated folk (since he was in no danger) kill Godzilla and then destroyed the city, he'd have Godzilla and Mechagodzilla City destroyed, and she would be no deader. If he allowed Godzilla to survive and thwarted the attack in order to save her, stopping the threat five minutes earlier, I totally get it- that's the right choice, I think (to answer the OP), evne if it is not the pragmatic one... but the idea that he just waited too long and got the worst of both worlds, losing everything to his own sheet incompetence...
That, I would not like.
Ditto. She sided with the fact that they have a common goal, and what one side is willing to do to achieve that is their call, as long as it doesn't effect the others. Which it ultimately did.
As for the strategy. The strategy needed ALL 3 Vultures to dive into Godzilla. The fact that Haruo was somehow immune to nano metal would have thrown a wrench into the plan since all 3 needed to be heat resistant for them to maintain control and direction, i'm assuming.
IIRC, Yuko basically went full on paralysis very early on. If Haruo would have blasted the control center then and there, it wouldn't have made a difference. If anything the nano metal would have been less invasive but still would have "nano-tized" some organs...limbs...rendering them use useless and probably some massive internal damage. Ultimately, it was a lose lose.