Yes, but that would mean it's a new story. Not associated with the games. I thought that was what the post meant to be about. Lol If it was simply including Starkiller into Canon, I guess it's equally as possible as how Star Wars Rebels had brought in Thrawn. Again, it would just be a new story.
There is the matter of tying into what is now iron-clad canon. Presuming there isn't already an explanation as to why the Inquisitors ceased to exist by the Original Trilogy. If there isn't, perhaps Starkiller could fill in that gap.