I've not used Adobe Muse, so I can't speak to its functionality too much. Theoretically you can import any site into CQ5, but it's not going to be a pleasant "click and go" kind of import. CQ5 is a content management system that has a lot more complexity (and therefore flexibility) in what you can do, where it looks like Muse just creates static websites. In terms of importing fonts/images/etc., CQ5 has the capability. Anything you can do with HTML/CSS/JS, you can do with CQ5.
Is this a one time thing? It seems like the workflow from Adobe Muse to CQ5 just wouldn't be worth the effort. What are you envisioning as a solution?