The fact that a single specimen works, or doesn't, with smaller fish is in no way a guarantee that the exact same combo will net the same results in another tank.
They are called predatory for a reason, and over the years I can't think of a single Rift Lake predatory species of fish that has not become hyper aggressive in a comm tank with other Rift Lake species. I had to add & subtract several times over with different fish, of the same species, until I found a mix that would get along with the others. I have witnessed the same in many other tanks over the years.
Considering what the OP has available locally, personally I would try this change with fish that will offer the greatest chance of success in what he is seeking, which is fry removal, sans the drama of violent escapades. All large predatory haps have the potential to become hyper aggressive, simple fact, so best keep that in mind before adding to your current mix of fish. Or not, your call. Good luck