I posted an idea years ago about turning Geonosis into some sort of super weapon. At the time it was the thought of having the planet essentially fly through hyperspace so it could make surprise attacks throughout the republic - so the mysterious ‘missing planet’ subplot could be about the hunt for the mysterious Seperatist Base instead of Kamino.

Another line of thinking could be that instead of trying to tie the PT to the OT, one could think of ways to tie the PT to the ST (giftwrap the OT). We are yet to find out more from the ‘Knights of Ren’ - but could this be something Dooku and Grevious be a part of? Essentially a third Jedi faction (if the sith are the second). Could the Star Killer base be a sister planet to Geonosis advocating similar technology? (Star killer always seemed like a clumsy prototype to the nimble Death Star to me).