I think the main problem with reprinting Night Raven (other than a possible lack of demand) is slogging through the various and sundry magazines where his stories were printed. Judging by the Marvel Appendix, he popped up in a lot of Conan and other reprint titles it might not be easy to gain access to.
White Hopes, Red Nightmares
The Anaesthetic Wearing Off...
The Snow Queen
These all come from the website 4 Color Heroes
You will need something like Comic Book Reader to read them.
Well, there is no turning back now. I just bought Knights of Pendragon Vol.2 #1-15 for £10. Union Jack's appearance will annoy me but hopefully I'll enjoy it.
Next up on the list... Incomplete Death's Head and the Death's Head and Captain Britain graphic novels.
If after that you need full completion of the DH stuff after reading that then Titan reprinted all the Transformers strips in which DH appeared originally in the volumes Fallen Angel and Legacy of Unicron.
If your aiming for the CB graphic novels then getting the two hardcovers of the pre-Moore/Davis stuff is the best bet....and then the omnibus if you haven't already. Frikking. Awesome.
My amazon reviews, check them out sometime!
It's actually probably an easier sell than MI13.