A Minecraft farm with villagers?

I know that there are already many farms on YouTube, but I need a farm that is very efficient and needs as few villagers as possible.

Try it here:

I know an iron farm that has been working since version 1.14 and only needs 6 villagers, but also 2 zombies with nametag. I also know another version with 8 villagers, but it probably only works in 1.13. Otherwise I would recommend building a Villager Farm to get more Villager.

I hope it doesn't bother if they are in English.

The 1.14 iron farm:

The 1.13 iron farm:

The Villager Farm:

The problem is that I can only use village

I play on a server and you can only protect villager from disappearing and this protection is very expensive

Thank you