In that case, could you simply export the website from Dreamweaver and continue maintaining it in a normal code editor like Atom or VS Code or one of the paid code editors?
If you have some HTML knowledge already, then doing basic content edits to your website should be quite an easy process. I maintain a couple of websites for clients that started life long ago in Dreamweaver or Wordpress, and I am periodically called upon to fix or update things a few times a year.
As much as design apps like RapidWeaver and Blocs look really impressive on the surface, very few of these apps are able to take existing HTML code. Because much of their power comes about through the use of modular design blocks, themes or stacks that act as containers for exported content.
If you really did want to build with RapidWeaver, then @robbeattie’s suggestion of rebuilding each page is probably the most practical solution.