Yeah, The Boss [Marc] did let that cat out of the bag, didn't he?
I don't know if someone would be willing to become a living weapon like a drone-fighter... In 'Agent', the Bland personality has a sense of 'self', of 'this is me, my body', no matter what form he took. And I'm not entirely sure that a 'Fighter Pilot' personality would want to become a kamikaze.
Beyond just that, it's made clear in the book that, at least up until Year 750 or so, the Third Imperium is keeping a VERY tight leash on that technology... not the skill wafer package, but the downloading of a personality along with the skill set. Yes, the Golden Age is 250-350 years past that, but I still think that if the Wafer Agent Warrant Program is still exists in 1105, the Third Imperium very much wants to keep that technology as secure and emergency-use-only as it can.
I'm also inclined to think that, for technical reason, the program no longer exists by 1105. There is a real inherent danger of misuse by the Imperial nobility if the personality overlay technology became common. Consider:
a] In 350, the year Jonathon Bland was 'downloaded', let's assume the Imperium had reached TL 13. As Bland goes from assignment to assignment, the Imperium has advanced to TL 14 [J-5 drives are TL 14].
b] At TL 13-14, the wafer can only be worn for a month. Let's assume that at a very mature TL 14, they can stretch that to 6 months. By extension, by TL 15 perhaps it's a year.
c] Now imagine some petty planetary dictator or Imperial Duke is sinking a large portion of a world's GDP into a factory that produces clones of himself just so he can repeatedly install the wafer and give himself 'immortality'. THAT would utterly eff-up the setting in very profound ways. Under those conditions, maybe the Virus Plague is actually a relief!
"Reputation is what others think they know about you. Honor is what you know about yourself." --Odin, Havamal