Take a gamma island, remove the Epi and Colliuxm, disable PBS and PVP.
There are no outposts or highways on the island.
No outposts makes using the island for anything productive unlikely, as you could do the same ont he alpha islands with much less effort.
So, all you'll really have is a place that players can go to waste NIC on terraforming (probably ***).
In general, putting in worthless islands will be met with negativity, or continual requests to make it useful in some way that would have to be ignored. Which would just get some players more upset.
Why can't it be made useful? Simply because it would then diminish the actual gamma islands, which are going to be hard enough to use, without having to complete with Non-PVP.
Its the same issue now, with Beta vs Alpha, and why many corps continue to use Alpha even though they own a beta outpost.