One thing you have to be aware of is which books he would appear in. Not every DC book reaches the public outside of a comic book store.
If it's Batman family, Green Arrow, Superman, Aquaman, Flash, Wonder Woman, whatever the mess known as the Titan franchise, Justice League & Deathstroke-he's fine.
The rest it's a crap shoot. Some appear and others don't. Too bad the New Age books are gone-there was plenty of love for Silencer.
And I did take your challenge of a John Stewart redesign. I just have to redo it on a respectable size of paper. Of course my design comes with something else. I will try to post the link (since I stink at doing attachment photos) this weekend. This will force me to do my other project with some guy in black & yellow.