I have experience with daffodil and i am about to get tropheus. I would not try them together. Daffodil are extreamly territorial while they are breeding, and they constantly are. Tropheus also are territorial but in a different way, more towards their own kind.
Another important factor, even with NLS, is dietary needs. Tropheus a herbavores while daffodil are carnavores.
Im my opinion they are both great fish, but i do not think they should be keeped together.