I think validating blocks should be done centrally as well. I can’t think of a good reason to allow it for the public for a government backed fiat token.
AFIK that’s the way premined currencies work. The “miners” (which are not miners, as you say they just validate the blockchain) are controlled and are not that many.
Unless you want to save money on electricity. But I would hope the goal of this is to make the digital tokens functionally the same as cash, the biggest part being 0 transaction fees.
There are transaction fees on cash too, it’s called GST, petrol tax, income tax, etc. This would just make it easier to levy taxes so we can eliminate more onerous taxes