Correct.
You want to do that then do that in backups like we saw in Allstar Batman.
Or you give him the B side story in a book like we saw at times with Falcon in Cap America in the past.
You can devote 2-4 pages of a book to Duke. Sure it will force one to tighten up the main story in a book but it allows you to set up whatever in those 2-4 pages and eventually put out a complete book or one shot.