IMO this one of those cases where dollars is ultimately benchmark than requirement, IOU/settlement forms can always be restructured/renegotiated if USD is no longer lender of last resort, i.e. alternative payment systems enables take it or leave it deals in medium/long term.
USD/reserve status snowballed because US controlled techstack postwar which US leveraged (along with military hegemony) to USD controlling primary energy (petrodollar). Civilization/modernity was locked behind USD. Money followed existential goods provider, that's the real USD / unipolarity moat. There's no take it / leave it from US company scrip because leaving eurodollar system = technical default (most usd loans hardcoded on newyork/english law) from eurodollar western financial system = death sentence. Once that lock/dependency erodes all kinds of force majeure geopolitics can rationalize breaking dollar contracts. AKA multipolarity.
If alternate techstack/payment systems pops up and reach tipping point, country A can just say to country B who only wants USD (due to alignment or whatever), I don't have enough USD, here's RMB & cips/Brics+ & mbridge basket of equivalent value. This geopolitical layer, if BRIC+ can offer fossil, food without US and PRC can offer renewable energy, capital goods, consumer goods, technology, including 80% as good semi and civil aviation... etc if chokepoint goods are no longer exclusively under USD perview, then USD enforcement mechanism simply dies.
If we're talking about loans/aid, IMF is really pittance, low hundreds of billions. It's why PRC is now using their 3T USD surplus to basically do their own shadow USD lending without IMF conditionalities... countries now don't need to buy USD from US. And somehow PRC currently lending / providing swaplines with their USD at lower rates than US treasury. Incidentally, this dollar recycling also lowers demand for new USD bonds, further reduce type1 margin buyers. This circles back to other nations own trillions of USD to each other... when you remove type1s, you're left with type2 private sector / non bank financial institutions - these are the buys where each USD bought increases triffin burden, i.e. they are the exorbitant curse / payday loans traps that makes USD reserve more expensive to maintain. Their demand is a trap, not a benefit.