Insurrectionists with random UNSC and Covenant ships could work (granted most of their ships would either be outdated, damaged, or heavily modified), though I personally look at rebel-held planets as Insurrectionists and Heretics already. Anything before the main Halo saga (ie. Forerunner army, Precursors, Ancient Humans (alluding to your Human/San-Shyuum alliance)) wouldn't really work well since there's not much information and ship design to go on and tbh it feels like being in the current Halo timeline with the modern factions anyways. That being said, this mod is amazing as is.
YeloMelo95
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