Don't even need the CBDC, fiat has a built-in kill switch.

Since fiat is a ponzi scheme, the state need only to turn off the printers. Like a game of musical chairs, when the music stops the state/bankers are the only one with a seat.

Debt service destroys money in circulation constantly, hense the constant need to print. Given that, everyone without a considerable amount of productive assets (non-fiat) ends up destitute pretty quickly.

When these destitute people have no where to turn but the state, looking for bread and housing, the state can then dis-intermediate benefits down to just a state issued pod and bug smoothies. Much more cost effective than the subsidy apparatus.