CloudForms with VMware and RHEV

Following quickly on my last question...

We have CF working with a fairly large VMware estate and I am doing a RHEV PoC - ideally, we would like to be able to offer the users the ability to spin up VMs on either VMware or RHEV from the same CF portal. I have been trying to work out how we fork the dialogs based on the template/provider that the users chooses when provisioning, but so far, not really any the wiser. Has anyone done this or doing this or have an idea on how it should be done?

I would appreciate any guidance at all here! thoughts, ideas anything.

Thanks
Bill