IF i had the chance to managed a certain government i would really apply blockchain technology and give their budget in a form of cryptocurrency or digital currency that could be used as a form of payment and could even trade to fiat money. In this way we could eradicate the corruption because the public could be aware on where the budget of the people coming from taxes will going through. Yet, until now the government is not interested on cryptocurrency or if they are they are not willing also to investigate and checked how cryptocurrency works and how could it will be applied on their system. They just want their business to continue as usual doing ghost project? I do not know maybe!
If the government really intend to have full transparency, crypto isn't the only way. They could simply release the full financial report. What happens in my country is these data should be publicly available but the government, especially local government, make it hard for us to find it. Applying blockchain to the whole system would require a massive effort and is a bit overkill in my opinion.