The realistic side of me thinks Chryst is about as close as we'll get to a "sexy" hire....meaning he is from outside the program, and that Kirks trusts him enough (as well as having similar philosophies) that Kirk might even let him tweak things a bit.
That said, part of me wonders if Kirk doesn't take one more shot here? He's made pretty big adjustments to his overall thinking a couple times when confronted with a need for change in the past. (We are talking like 2 times in 25 years).
I'm not suggesting Bob Stoops will come back as OC, but let's use him as an example. What if they were chatting, and Kirk confided in him that he maybe had two years left. Maybe a guy like Stoops said he'd love to be involved for a year or two with the program again. And Kirk says great, we're gonna make up some title for you (Ambassador/Senior Advisor/Chief of Staff) - and your top priority is bringing in the best OC you can, who will get to design the offense he wants with you advising (if you wish). Stoops has a great network for that.
Maybe it's not Stoops, but I'd think Kirk could really lean on another old guy to come back and have fun with him for a couple years. No real pressure, he's only bringing in the OC and helping out....and regime change would be coming soon regardless, so no real fear of the staff getting fired. If it goes poorly, people will blame the OC. And Kirk can throw his arms up and say see, I tried what you fans wanted.
Maybe it's Philbin and O'Keefe in the senior roles, and Raih as OC. (Just another example). Maybe Morgan comes back to coach offensive line for a final season with those guys, too. Seems like if Kirk had a last year or two in mind he might have fun with a couple guys on a similar timeline.