I would not feed them if you cannot regularly feed them. FHM do not need to be fed. New pond tend to be more fertile and will get your fish off to a great start. I think if you go with that stocking plan and the patience involved, you'll be happy with the outcome...
As far as stocking GSH with FHM. I have often mulled over the same question. FHM nest in an unusual way compared to many fish in that they lay their eggs on the flat side of an object, usually close to the bottom with the male guarding the nest. I believe this type of nesting style greatly eliminates the predation of FHM eggs by GSH. In my current pond in which I am building a forage fish cocktail, I have species of forage fish such as banded killifish and spotfin shiners which do not guard their eggs after laying them. Therefore I left the GSH out until I have solidly established these species first. This spring I am finally stocking GSH into the pond.
