Ah, I see, you are looking for a generic XSLT to convert HTML into WordML. And you don't want to write it yourself because it's a large and complicated task and surely somebody must have done it already? I would definitely agree with that.
But I don't exactly see a solution when I search the web for one. If you look at
this article, for example, you can see the complexities involved in converting HTML to XSL-FO, and exactly the same would be required in converting to WordML.