While that may work in practice, it's highly ironic. I use my fiat to buy Bitcoin, then I purchase your product using Bitcoin, then you sell your Bitcoin to earn fiat. What's the point of Bitcoin in the first place? Isn't it unnecessary? Why would merchants accept Bitcoin as a payment method if they don't insist on its main purpose/philosophy?

It was created to prevent the requirement for a financial institution. Not to add an extra layer around it.