If you were to pair a Cuban with a fish that has a nice sized nuchal hump (kok) and were willing to raise and cull a lot of fry you would eventually get a fry that is mostly Cuban looking with a nuchal hump. Possible but time consuming.
Either flowerhorn or an amphilophus vieja as well could allow for nuchal hump development.It's gonna take some time and planned breeding to get a full Cuban look with a hump on the head