Maybe the PT could follow much more recent events. The struggles of the Rebellion against the Empire. Nothing from the pre-Empire period. Forget about it being a backstory of Anakin or Obi-Wan or Luke. It would work really well with Star Wars '77 if episode IV is still the first time we meet Luke, Ben, Owen, Beru, etc.

Hey, I think this idea is a goer! Up until now, I was playing with 30 year gaps between the trilogies but what if the 9 episodes play out over a much shorter time span? Throw out the trilogy of trilogies? Nine episodes following the Rebel Alliance up until the overthrow of Palpatine. Leave the Clone Wars, the Old Republic, the Jedi all glorious mysteries, as they were in 1977!