I'm interested in what they'd go with if one did show up considering they do use the Requiem Predalien, but if I'm not mistaken one shows up in the Judge Dredd book like the Requiem concept art (I didn't read it and I'm referencing scans).
As far as dreads, keep them. Just raise the crest up like the Predator and drape them behind it like the host. No reason to reinvent the wheel on dreadlock placement. That being said I wouldn't mind if they are removed if it allows the artist to retain the coloration, mandibles, and heavier build.