Not sure how Valkyrie drones would fit into the doctrine. I've been thinking about doctrinal and tactical changes for modern full scale peer warfare lately. For aerial battles, I'm simply not seeing the viability of "cheap" CCAs. CCAs' purpose should be to leverage industrial capacity to maximize the use of human capital. A competent J-36 pilot would take years to train, but an aircraft can be manufactured in weeks to months.
So I think CCAs would essentially be unmanned 6th gen jets, perhaps with swappable mission packages. They'll be cheaper than manned jets, but not by that much. Maybe half as much as they're unmanned and don't need much avionics.
If you want cheap CCAs, then it really would be more versatile missiles. You would launch them with no particular target in mind, knowing that they're on one way missions and they'll be assigned targets by your aircrafts at some point of time. Maybe something like a 2-stage turbine/rocket propelled stealth missile, basically a stealthified, longer range PL-15 costing say $3 mil. They'd be assigned vulnerable targets by their 6th gen companions since they would have a pretty small payload (say 20-50kg), ideally opponent fighters, AWACS, or ground/ship based radars, but could also be lower value ones like tanks, IFVs, or even trucks since they're not coming back anyway. They'll then shed their stealth trappings, turbine engine, and basically become just a regular missile and start the rocket motor for a suicide mission.
Such a "CCA"/missile would IMO be preferable to the Valkyrie as I just don't see the Valkyrie doing anything. They can be detected by pretty much anything in a peer conflict and shot down by pretty much anything as well, and they only carry 2-4 SDBs each and can only fly at Mach 0.8. They seem to be more useful when you've already achieved air supremacy, but by then you can just use regular drones. If they can't survive, might as well design reusability out of it and make it into a missile. Take away reusability and make the payload smaller, but make it stealtheir and faster at the terminal stage.