Using the Encore instead of the Epi is the same thing your doing now. The encore cannot easily be made into a stereo amp. So either the Epi or the Peavey is still just a sattelite amp.
I've had guys ask me to build them a stereo amp before. Though I never have because once the customer hears the price they run screaming like a little girl. But it's not a new idea. There are a couple of stereo amps that have been popular.