Scholars do not summon primal aether like summoner does, so unless they introduce some new lore, its very unlikely that SCH will get anything titania related. Arcanists can summon aether in different shapes and sizes, carbuncles are just the commonly used shape, SCH however is summoning lily, a specific fairy, and SMN is summoning primal aether. We can also assume for now that Titania was summoned like any other primal