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In sanctioned play, if my main deck team consists of General Optimus (Wave 3), Sentinel Ironhide (Wave 2), and Sentinel Prowl (Wave 2), and I have Sentinel Optimus (Wave 2) in my sideboard, can I exchange Optimuses (Optimi?) between games and still get the remaining Sentinels in my KO Area for an Optimus Maximus plan game 2?

Yes.
Source: Wizards of the Coast (2019-07-29)    【Link to Ruling】
Tags: Optimus Prime, Gleaming Commander