Someone in Poland did it already. In first second I thought it is a very stupid idea (and I think so even now, though). But it worked for quite a while. Let me mention discus form was not the delicate one, just one of those kept and breed in Polish tap water for ages. But I have no idea how it ended.
All in all I think mixing fish from different continents, with different requirements, different "body language", and different everything, is not the point of fishkeeping as it should be.