Locke was overhauled in 1.5 and probably won't be reoverhauled until MORE character overhauls start- though strictly speaking if Citrine wanted to write a Locke H-scene, nothing would stop them, and it's very possible that the greatest incentive, money, could influence their decision on this. Knight on the Patreon would let you influence this and Witch would give you some more feasible sway but even then you would still have to convince other voters about Locke's merit.