Hey guys!so I'm playing on a world with some extra rules that are more challenging than vanilla Minecraft and I'm trying to design the most efficient sheep farm I can make. The farm doesn't have to be afkable but that's defiantly a bonus. If you guys could help me solve it out that would be awesome! Here are the rules:

1. There is a limited number of sheep I can have in one space (so a ton of sheep in one block don't work), let's say 20 sheep on a 50 block radius.
2. shearing sheared sheep will cause them damage and kill them.
3. The game mechanics are 1.12 version of the game.
4. I can use hoppers but it needs to be the least is possible (hopper carpets are not allowed).

Keep in mind those rules are applied by plugins so there is no way to bypass them.I tried to think about a Redstone feed tape thing that would make sure the sheep will always have fresh grass to regrow their wool but got stuck in the way.If you feel like challenging yourself with this design and helping out Ill be really thankful!Have a nice week :)

Edit: the idea is not afk shearing, it's more maximizing the rate the sheep has grass to eat from instead of waiting for it to grow back (grass spearing time is randomly and can get to 2 min and 45 seconds and that is what I'm trying to avoid).