True, spartans had no intention of exporting their ideology or political system..
Actually they did tried to "export" an oligarchic/aristocratic political system that was far more favourable to Spartan's views and interests. It's just that it backfired and was extremely dependent on Spartan military help, too much for Sparta's sake and possibilities.
As for land reform, it's always possible but giving the fragile balance on which Sparta's power was based, it would certainly mean a crisis which would have been used by northern Peloponesian or Central Hellada polis and hegemonies, IMO.
Rinse, and repeat basically. It's their best way to not alienate everyone and still remain a hegemonic power.
Maybe with a shorter Peoloponesian War without Sicilian expedition but where Athenes still loose? It would make Sparta less incline to focus on Central Greece, and without real motive to keep foes and allies alike in check.
They did used subjugated peoples as military auxiliaries, but raising even some of them as Spartans would have given them ideas upside their condition.or at least take military-fit males back to Sparta to do so?
Sparta really didn't need any more subjects/hilots/inner ennemies rebellions.