About 25 years ago on the old Prodigy board I proposed something similar.
Since would couldn't get the conspiracy hobbyists to offer a complete
scenario of the shooting, I challenged the LNs to come up with one. My
conspiracy involved Oswald being a hired gun. If I remember right, I had
"they" being the Mafia and one of their guys knew Oswald worked along the
parade route and that he needed the money so they offered him a ton of
cash to do the deed. After he got caught, they sent in Jack Ruby to shut
him up. That's the best I could do. I couldn't possibly come up with
something as silly as Oswald was innocent. There's no way I could possibly
make that fit the evidence. I also couldn't keep up this charade for a
week. I'm one and done.