This is one of the better looking implementations of "checkout on top of stripe" that I've seen (I've seen a lot).

I'm not sure of your target market but the best advice I can give is to make a WordPress plugin to go with this. Website integration (easy for us, I know) is probably daunting for most people. That's why SquareSpace is so attractive–it's all built in. But if you went after the WordPress market with this, it could be huge.