While I love Morrison's Superman origin to death, I think DC could just take the broad idea of Morrison's run and then transplant an origin for this Superman from it.
Like one of the cooler aspects of the origin and run was the idea of having Clark go through the transition of Golden to Silver and then Modern. They might switch up the look a little bit for the sake of differentiating the aesthetic from New 52, but they'd very likely keep the same tee shirt and jeans idea at it's core. I could see them doing a sort of neo Golden Age where they basically retell old Golden Age Superman stories but in a modern setting and aesthetic for the most part. I could see them doing it less for the idea of sticking to Morrison's original plan (which doesn't quite line up with the current Superman as he himself has said) and more in the interest of celebrating classic S&S and old Fleischer cartoons. I foresee a tee shirt and jeans (variant) Superman punching back a laser beam coming from the top of a mountain where Lois is held captive.
Then do the same with classic suit representing his Sliver and Bronze age. They could basically do callbacks to Superman The Movie, his Silver Age stuff, and Jurgens' stuff. I see them using the Morrison origin as less of a 1 to 1 origin and more of a springboard to basically give Superman the experience of 70+ years shrunken into 15 or so crazy years in one guy's life.
My own personal idea:
One of the Superman writers (my pick would be Tomasi and Gleason) doing a whole arc (5 or 6 issues) of the Clark's life story. Hell, Tomasi and Gleason even have the perfect set up since they can have the framing device for the story be Lois telling stories to Jon (a string of bedtime stories maybe?). If I'm not mistaken, Jon still hasn't heard all of the ins and outs of Clark and Lois' adventures back in their time. I remember Clark even saying something like "that's a story for another time." Anyways, remember how the 70s Superman movie opened with a kid reading a Superman comic? Maybe open this arc with Jon mimicking that kid but with a scrapbook Lois has kept? So maybe in the story Clark is off like a galaxy away attending to a call, and Jon is worried about his dad because he can't go with him on this one. So Lois decides to tell him about some key moments in Clark's life (as well as her life as pertaining to Clark) to rest the young boy's mind. Some stories are big and bombastic galaxy jumping adventures, and others and intimate American Alien style stories about a guy. You don't even have to have each issue flow into the other in a cut and dry way. Treat it more like the comforting and thrilling stories for Jon that they are meant to be. But it's not a Tolkien epic.
BAM! New origin. Homage to the great stories of the past. Morrison inspired. AND doesn't completely break the flow and mission statement of the current Superman book which is family. I've basically put birds on the endangered species list with just one stone