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I get the argument for stablecoins in emerging markets and regions where access to dollars is limited, difficult or expensive. My wife donates monthly to a church in Africa that helps provide food and necessities to the local villagers. She sends USD through a local financial services company and they charge I believe around 16% fee. That takes a big bite out of what they end up getting. I contacted the food distributor by email and asked if they would take bitcoin instead of USD. They said no they could not they needed USD or whatever the local currency is (I don't even recall but they mostly dealt in USD) to pay their suppliers.
I can see the use case for a USD stablecoin in this type of instance. They would get the money right away and for very little fee and if all the local suppliers agreed they could pay them in USD stablecoin as well.
The only question would be when they need to port out of stablecoins and into tradfi banking system USD or the local currency, how easy would that be.