Is there a way for China to start industrializing at the end of the first opium war?
I'd say not anytime before The boxer rebellion, and still then, it'd be unlikely.
It was entirely possible to industrialize China with it's first contact with the west, by the time of the Opium War the Qing is so corrupt that it is practically impossible without a sweeping of the state of corrupt elements through state sponsored eradication of the corrupt and powerful or rebellious coups. You could reasonably do this immediately following the Opium War if you give it the right divergence.