> A cryptocurrency can be a very useful solution here: it skips decenies of progress

The fact that it is a _cryto_ currency is merely anecdotal. Its an implementation detail. It makes people think this currency is actually distributed as most other crypto currencies, while in fact it's just a consortium of companies having total control over all aspects (issuance, destruction, etc.) of the currency.

> set up an interoperable network for banks and custodians to use

This is just plain wrong. It's not banks or custodians that use this currency, it's just end users and the consortium. Banks are heavily controlled and regulated. I _mainly_ trust governments and legal systems to take fair decisions or litigate properly monetary issues. There is nothing like that here. The consortium of companies owning the currency decide the amount they want to create, they decide who gets refund and why, etc. I have much more trust in a country and a judiciary system than a bunch of worldwide companies to handle my currency.