my slop idea is to send a pop up to all xeno players “do you wanna be a queen”. If there are no “yes” answers, hive forfeits having a queen for the round and gains passive buffs 
I remember a round where there was no queen, was a long time ago but no one wanted to go queen and we got xooc of we wanted to fight without queen. Hive wanted too so we got hivemind/evo activated and the round continue. It was fun, I am sure the admin spawned queen on a different z level or something. But if xeno want to, why not. Just evo/hivemind activated after 15-20min roundstart? After queen spawn and she dies the hivemind/evo does like before