(Note: we could re-roll the end every few weeks to reset it and start anew if we wanted to)
This makes spawners difficult to maintain, if impossible, because people have to rebuild them and reset their warps every time a new End is generated. Even with world edit, that would be a massive pain on the mod's side. Are you proposing spawners be removed?
Having to remake them would make the massive benefit they give equal the amount it takes to build (Ako: "PS: I hate the spawners, they are comparable to a exploit/glitch."). And being in an area that would not be griefed is not that hard just takes alot of time to get there.
But we really could just reset the mainland its not that hard just cause a lot of lag but still better then having to take the server offline to do it.
I still like our current of any pvp is allowed (As you should not have a home set to the end or that is your fault and take advantage of being able to use /sethome and remove your bed which in normal play you would not be able to). No village protection and griefing kinda go hand in hand as in the overworld the reason for not allowing village protection to anyone is so that failed villages are unprotected and the community gets rid of them as they go inactive without having the admin take care of it, but in the end since we are not allowing village protection it would make sense that griefing would be allowed.
But first thing I would do if we allow griefing is go find all the current spawners (I have found a few by people mentioning hey anyone want to help me build a spawner and I sit on the mainland and watch what direction you build.) and then lead raids to them all.
So personaly I would chose option 3 and have it as a battle world where its kill or be killed with people building their bases around the edge (as far out as they want) and then making it a last group with their base left wins. Then we can have battles for ground and you have to protect your spawner if you want to have one.
Option 1 like I said just seems a little counter intuitive.
Option 2 makes the end just like overworld and the nether will it is really not that similar.