I have tweaked some of the Dark Imperium Hellblasters, and I am painting them as Space Wolves. I am planning to make a few changes, so for the pack markings I am just going to use Runes rather than the normal
SW marks. I will probably just give them the standard Ragnar left shoulder pad until I see the codex to decide what Great Company i am running.
As for making them look more wolfy...
(apologies for the horrendous looking paintjob, I was ill when I was painting these guys)
Normal
SW heads fit onto the Primaris bodies, meaning if you have a
SW pack lying around the 60000 heads they give you in the box work well. You can also add extra wolf tails and bits, as well as using some of the other items to customise the backpacks. There are also some knives you can strap to a thigh pad to make it look like they have an extra
CC weapon, always a good idea for a
SW!
As for the Primaris and Space Wolves as a whole, there is apparently a
SW Primaris chapter, though how close they are to the main wolves is unclear. Apparently they were left on a moon to guard something, and are pretty grumpy about not heading off to a fight!