I think this is a fair idea. Bees should naturally spawn in appropriate biomes like other creatures do, and when they spawn they should check around for a couple of minutes for a hive that can hold them, and if there isn't one they should make one. The only thing that is then needed is a check that prevents additional bees from spawning if there are say... 12 bees in the area or more. Something along those lines, to prevent them from spawning endlessly.
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