Few thoughts to begin with:
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Whether both sides are fighting in earnest, or are they proxies backed by bigger countries/coalitions behind them? Do their backers eventually get into the fight? (new liveries for the backing belligerents)
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Famous aces and squadrons on both sides, maybe with advanced AI that reacts faster/shoots better/can multitask, can only deploy after tactical/strategic threshold is reached, has their own unique liveries when deployed by AI and grants extra points when shot down, in return for being more dangerous
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Kramenka Industries - the creator of the Ifrit - playing both sides of the war for corporate profit. Has their own squadron with unique liveries that are technically testing/demo aircraft, but is in fact fully functional and can shoot. (accessible from both factions) Has missions of their own that involves purposefully sowing chaos to get Boscali/Primeva riled up against each other
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External mercenary company/ies with their own liveries, available to both sides, has difficult missions that involve sneaking around and doing deniable airstrikes. Maybe even have their own famous aces/squadrons with unique liveries that use the advanced/difficult AI models, complete with the extra points granted when downed?