Thanks for joining the forums, my friend. I'm not sure how much help I will be on this (I have looked for tools like this in the past, unsuccessfully) but I can offer our Mockups to Go community site.
There may be some custom controls there that save you some time if you have to rebuild the layouts by hand.
If you come across a good HTML ---> BMPR converter, please let me know. I'd love to be able to add it to support documentation!