Given that Kycillia would have every reason to not support the Delaz fleet, I don't see Operation Stardust being as succesful as it ended up being without the Axis reinforcements. The attack likely would have proceeded, but without his epico advancedo suit, I don't think Gato would've stopped the Federation fleet from sending the colonies off of a collision course, and thus Operation Stardust would've only been partially succesful. I don't think this would've ended up with the Titan's not forming or any other serious changes, though.
When it comes to Zeta, I see roughly the same sequence of events occuring. Though I believe that a Neo-Zeon headed by Kycillia, Char, and non-edgy Haman would've assisted the AEUG from the start, and as a result the Titan's would've been eliminated sooner. I don't see this version of Axis forcefully engaging in a war, since Kycillia doesn't really come off as a warmonger. Char likely would've sticked through with Axis this entire time, since the only reason he became disillusioned and left is because of Haman's desire for power and to control the Earth sphere. But having survived the OYW with him, as I said earlier I see this version of Haman being a lot less edgy and probably cool with Char's idea of Zeon just being a chill place in space.
Obviously, since no Neo Zeon war, no ZZ. Judau gets to be epic junk man with his buddies. I wonder if Glemy would still be simping for Haman though, if she was clearly doki doki for an alive Char. Going further, I see Kycillia and Char overseeing a gradual transition of Axis into the Democratic Republic that Char wished for, so I see no reason for him to get sad and try and colony drop. This theoretical timeline seems to me like it'd just be Early UC without as much war, what with no Zeonbabies running around throwing a tantrum. ZZ wouldn't happen, CCA wouldn't happen, Unicorn wouldn't happen, all in all it's kind of sad how much better things would be if Char just went the Haman route.