WHMCS Module Development - SolidCP Hosted Exchange Creation & Management

I would like a WHMCS module to have the email creation & management fully managed from WHMCS. Almost like cPanel extended, but no option to login to SolidCP. Fully managed per client on their client area. Obviously the client would have to create the Company/Group and then the email accounts therein. They would need to be able to do the basics like creating emails, deleting mails, updating passwords check statistics etc. And then we would bill per email account created. The simplest way to handle this I think would be to have a per product email address. Meaning each email created is a separate product in WHMCS. But the actual process would have to be simple for adding mail addresses (maybe adding it in the ordering process would work?) Obviously it would be linked to a product so that if the space is used up, we need to be able to upgrade the mailbox from WHMCS