Hey, Patrick. I did present another scenario that JFK could have did while he was on his sailboat. Lost at sea with no body to be buried with very few witnesses who saw it ... so to speak. But lets look at something else. If your reverse conspiracy theory is correct, how many people were in the loop and how many people had to be drawn into the loop after the ruse? Did Bobby, Ted. his mother know beforehand? His relatives? Close friends? Etc? Now the ones who would have been drawn into the loop with no choice. Doctors? Nurses? A priest? People taking autopsy pictures? An undertaker? God knows how many more. I don't see it.
That is the good question and number of people was not huge. You have two groups, first are those directly participated in the plot and second group are those who knew about it.
Direct participants were JFK, Jackie, Clint Hill, Jack Ready, Kellerman, Greer, Landis, Kinney, Roberts, Hickey, O'Donnell, McIntyre and Malcolm Killduff. Possibly 2-3 SS agents more.
The main issue was to provide a switch body at Parkland hospital. On November 21st there was a murder and suicide at Abilene when a man (similar age and constitution as JFK) killed his wife and then committed a suicide by shooting at his head through his mouth and his body was used as switch body at Parkland Trauma room 1. There were at least two doctors who prepared his body and helped with the switch. One of them was Dr Fouad Bashour. Among this 19-20 people, there were pilots of the JFKs Caroline plane and there was Hoover who also knew about the plot and there were two ladies at the Love Field. So, in total, not more that 30 people knew what is really happening.
RFK and Ted Kennedy knew about it, JFK mother also knew but I think that it was kept secret from his father. Caroline and John Jr were the greatest risk but I also think they both knew and spent great time with their father until he died in 1967.
Also, there were more people who knew it after 11/22/63, mostly doctors and nurses who treated JFK in Florida.
One of the main participants is still alive, Clint Hill and he was never asked the question if the assassination was faked and maybe it is better to remain that way.