I also already shared this elsewhere, but in case anyone here is not also reading there:
I had a story idea a long while back for a scenario centered on the colony, focusing on the "JJARO WERE AT TAU CETI" map writing, that might have some ideas you're welcome to scavenge for this project if you want.
My old idea was for the colony-centric scenario to be sort of a prequel to M1, set in a timeline where you never boarded the Miriata to go up to the Marathon, and were therefore on the colony when the Pfhor attacked. Aside from fighting off the Pfhor, you would also get drawn into a mystery surrounding an excavation site outside the colony, unearthing what turns out to be a Jjaro AI something akin to Thoth. MIDA/Strauss would be involved there, as that is the actual secret reason for the whole mission to Tau Ceti in the first place. This also harkens back a little bit to the abandoned Marathon alpha plot.
Because the colony is doomed regardless of your actions there (in the canon timeline, the other nine Battleroids save the colony, but then the Pfhor show up again three months later and nuke it from orbit), but the rest of the universe is doomed (because Infinity) unless you survive those events and go off with Durandal, that AI keeps sending you back in time to do things over again, sometimes involving visiting the Marathon along the way, until you figure out that the right course of action is to not be on the colony at all, but to take the Miriata up to the Marathon to be there when the Pfhor attack, leading you to the original M1 timeline.