Is it possible for a seed to exist that doesn't generate villagers naturally? (project)

I want to create a server with friends where villagers don't spawn naturally, only zombie villagers. Considering that villagers greatly facilitate game progression due to the slave/trading system, I'm considering preventing them from spawning naturally, only allowing them to appear if you heal them. I tried a plugin that restricts mob spawns, and while it worked by preventing villagers from spawning, the problem is that when I heal a zombie villager, the resulting villager disappears instantly. If anyone knows of a seed (if such a thing exists) where villagers don't spawn, or any other solution, I would be very grateful.