I don't mean to rain on your parade, but I don't think ideas of wholesale reform (which with the benefit of hindsight we can see would have been a smart idea if anyone had proposed it for any Greek state) of the Spartan army would have been well received by the Spartans. Their military and in fact whole society was premised on their fighting as hoplites. The egalitarian elements of the country (egalitarian as between the Spartans, not vis-a-vis the helots) were a direct reflection of this. Something tells me that trying, at a stroke, to make them a combined arms force with professional and guards unit would have been futile.