I don't know about what might be simpler, but the idea of activating a type of channeled spirit and then having its selected or previously selected bonuses added into the existing "base medium" details would align with other such class based decision making. I would look at Ultimate Intrigue's vigilante class for a little inspiration - they have a social identity and a "combat" identity and they can be swapped out in play easily. Of course, the medium calls for many additional options to be called on, but the thing a player would surely need most is for the previous selections to be retained and inactive when the spirit departs.
Test the results of a mid-teens level medium channeling a Heirophant spirit. Then change the spirit choice to Archmage and look at what happens to the validation. Utter chaos.
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