I am looking for the same thing. I found a hosting website which uses Wordpres as platform. But the integration is done with WHMCS .
I am sorry for posting this but it would be great an Wordpress plugin which will be able to integrate any template with whmcs.
I tried for wheaks to do a good integration between them, but i failed each time.
Unfortunately, so far i didnt find any plugin capable to take care of hosting as the standalone scripts. (whmcs, clientex)