How to convert a site from Joomla to Wordpress?

I have a client who has a site that is Joomla and wants fully managed Joomla hosting. I told him (after a lot of searching) I couldn't find anyone here in the USA that offers that. I suggested that we convert the site from Joomla to Wordpress, as in the long run will have many more advantages, and also there is already a few really good options for fully managed wordpress hosting.

Does anyone know of an easy/safe way to convert a Joomla site to Wordpress? Thanks!