My understand is Roddenberry volenteered after America entered the war and wasn't drafted. If Roddenberry join the military in the early nineties, the basic timeline of his life would play from there, following the military, time as a airline pilot, then time as a cop.
Creating the man who developed Star Trek.If Roddenberry (born a half century later) proposed a series similar to the one that was originally made, it would not look anything like Discovery. Drawing on his own life experiences, probably more real world military than Discovery, in tone (not plot lines) maybe like NCIS.
A somewhat more serious version of The Orville, maybe with elements of The Expanse.
Yes, but lighter.