Even when government would want to give fixed addresses, they can't force you to use it. They would not even know if you use bitcoin and send and receive them. Since they don't know the addresses are yours.
When has "
can't force it" stopped the government from coming up with draconian laws before?
They will outlaw the use of non-whitelisted bitcoin addresses even though they cannot reliably enforce the law. This just gives way to more corruption. Even though LEs would be having hard time trying to track the IPs to the responsible "criminals" who used bitcoin illegally, they will try and they will put some people to jail. It will be enough to scare the sheeple and demotivate them of using bitcoin illegally.
So sure, you can let them give you the addresses but i doubt bitcoins would think of their blockchain as the real bitcoin.
Sorry but I don't understand what you want to say with this sentence.