Yes, even if react-twc has been created to solve Tailwind CSS + React productivity, it is not linked to it. It creates class based components, so you can perfectly use it without Tailwind CSS.
No, props interpolations are not supported. I tried to make this utility as small as possible and I don't see a real advantage over passing the function at the top level.
react-twc is not a simple port of styled-components for classes. I tried to create it with today's practices and to keep it as small as possible. I added some very useful features like the support of asChild or the ability to specify your own compose function.