One way would be to pay them in Bitcoin first - to make sure they can find an offramp (Bitcoin has a fair few - nearly a decade of existence buys you that much market penetration). Then, ongoing you can pay them in BitUSD and they can exchange it to Bitcoin whenever they want to offramp. There are gateways in the wallet for super-simple conversion from bitUSD/BTS/Other DEX assets ->Other cryptos (like Bitcoin).