That fact that you think “idealistic version of early US” is a compliment is very telling.

Your proposal is just an idealistic version of early US. You claim that corruption is fundamentally impossible, but assume that magically “the monarchs aren’t allowed to own property” without regard to enforcement. You claim to have an alternative to democracy but still propose majority voting on replacing rulers and constitutions. You simply assume that monarchs will keep each other in check and not devolve into the conspiring, warmongering tyrants that history is full of.

Power can always be abused to get more power and go against all your original ideals. The only way to definitely prevent corruption is to ensure power is never concentrated in the hands of few.

Both, but the US in particular.