Well, first off, there’s more than two. Second, if you want to start inserting PT stuff elsewhere, you should start with the OT, where timeline-wise it’s more relevant.
This is true, which is why I like the battle droid in the sandcrawler in Ady’s edits. If you built off of this, it would make sense to see one or two Clone Wars-era ships in the Rebel fleet in ESB and ROTJ. I wouldn’t mind a little easter egg like that (did Ady mention putting the Ghost in the Battle of Endor?). I think something like the Republic cruiser from TPM would fit in with the Rebel fleet. Maybe even a Separatist cruiser.
Totally unrelated, but back when TFA came out I was a little surprised how normal Bala-Tik, leader of the Guavaian Death Gang, looked compared to his cyborg henchmen. Not a big deal, but I kinda thought it would be cool if Bala-Tik had one glowing red eye, as if he had an implant or something. But not an in-your-face, Cyborg, kind of effect. I was thinking something kind of subtle, like the “light splitting” effect used in Bladerunner for the Replicants, except that instead of the glow being a faint yellow, it could also be more of a faint red. And the intensity could change depending on his position, simulating how the effect works practically. So for example, when he walks up to the camera in his very last shot, as his face approaches the window, we could see the red (or yellow) eye effect become more noticeable, as if he was stepping in the right position for the light to bounce off his eye into the camera properly. Don’t know how difficult this kind of visual effect would be, though.