Well after keeping frontosa for a while i've decided to take the plunge and go for it big time with Tanganiykans the tank is now mature and fish have been added, this is my selection any ideas..
4x neolamprologus tretocephalus
3x julidochromis regani
2x tropheus duboisi,
2x tropheus moori samba red,
5x lamprologus lelupi,
2x neolamprologus brevis,
2x altolamprologus calvus,

Tretocephalus can be nasty fish mate, be warned!!!
I have one left out of three, I know for a fact he killed the others.
Still, the remaining Tret is a beaut, and is pretty well behaved, though he is surrounded by much bigger fish for the most part and never bothers my Leleupi.

Your mix can be done but I would do this:

Remove the Tropheus,they have different diets and either them or the omnivorous fish will suffer.

If your tank is over 4ft you might have a chance with the Trets as they are known.I personally would like to keep them but would do so in a Tret only tank.

Id go for more brevis and make sure to provide shells for them.

Cylindricus would be a good addition to that mix.

Best of luck with it.HTH