Amusing thread... Hempy, according to your profile, you're 18 yrs. old? No disrespect intended, I was 18 once, but some of the people you're telling off are respected for their knowledge and decades of experience. I sense no point in me joining the hybrid debate, but stick around here a while and you could find these same people to be a great source of information and help over time.
As far as your basic questions: Jewel fish are risky in the tank you propose. Some individuals aren't too bad, but some are psycho killers and the psychos are capable of making a mess of a much larger, non psycho SA cichlid in short order-- personal experience. Bad risk for what you're proposing-- my opinion.
What are the dimensions of your tank? The longer the better, since you may have a sometimes it works, sometimes it doesn't situation with the pair you're talking about. SA cichlids are often choosy about partners and can be quite hard on each other in a small tank if you don't get a pretty cozy pair.
A Malawi type tank with SA cichlids is sort of an oxymoron, a contradiction in terms, they're just different fish, different selective pressures and survival tactics. Maybe I get what you're thinking, though. The difference is you can, and with some types probably should, crowd Malawi cichlids. Not a good way to keep most SA cichlids, especially getting into the medium size species or larger. Some species like a crowd as juvies, but need space as adults, so crowding them has a shelf life at best. Stuff too many into a relatively small tank and you can end up with trouble as they grow, or at best stressing and shortening the lives of species that need more space compared to their African counterparts.