Hmmmm. I wouldn't waste my time with the Artemia, even enriched (I've never had any success there, and it's a lot of work and requires a lot of space for near-zero reward).
There's a new deeper-water species of Sepioloidea (as an aside, I believe all New Zealand species of Sepioloidea should be transferred to a new genus) that we were collecting 200-350 metres, mid water, that we were able to transport by air in bags of water with a squirt of O2 in there. Mortality en route was zero, but they were mature (or almost mature) individuals when we caught them, they deposited their eggs within weeks, and almost all died shortly afterwards (no maternal/paternal care). Ours were fed on a mixed soup of amphipods, macro-zooplankton and mysid shrimp. The tank was 5000 litres, with ~ 30 individuals in there; I'm not sure what part cannibalism played in eventual mortality, but from memory the number of whole animals (dead) that were removed from the tank added up to the number of animals placed into the tank (so I don't believe it to have been an issue).
I've not tried it myself, given we have live feed available, but can you picture one of the garden-sprinkling systems (the brand available in NZ is, I believe, 'Gardenia') of a hose into which you screw the plastic uprights and then a tiny wee end piece that directs the water spray in the direction you want. Well, get the plastic uprights and then turn them upside down in your tank (so that you are squirting water to the bottom of the tank), and have an end piece that directs water in all directions. This generates an upwelling that suspends dead food (mysid) fragments in the water column (works a charm for seahorse).
I don't know if it will work for squid; mine (at 3.5 weeks old) will still not take dead food; it might be several months before I can wean them from live to dead shrimp/fish.
Did you get the Rossia in the end??
Cheers
O