Dark realm miniatures is actually a separate company, Microworld just happens to stock them.
When I first got the Dark Realm Light infantry the quilt like effect on their armor did remind me of Elysians, so that might be worth looking into. The AT infantry has HMG's which remind me of heavy bolters, but then again so would most sci-fi heavy machine guns I suppose.
With 6mm stuff like this you need to boil down to what is really iconic for that kind of troops. And for elysion I would say light armor with that padded look. Epic space marines have shoulder pads that are even larger then on the regular ones.