You need at least a new PCB, an updated firmware/kernel, updated software. It's not trivial.
Having work with hardware, I highly doubt you can pull that through in 2 months.
As for manufacturing, they might have all the components, but you still need new assembly lines. And not for small runs, for million of devices. With China on lockdown.
Apple are amazing at logistic, however it's been months in the making, nothing reactionary.