Yes, I totally misunderstood. I thought you meant you could be 7 blocks away, not 3.5. That is why I figured you could stack 4 mini-farms corner by corner and maybe even one layer over the other, with the player in the center of that whole thing.
3.5 away... man, that is brutal. The only chance then is maybe 2 mini-farms with one over the other although I'm not sure even that is close enough, then let the rail take you to one set after the other.
If it is truly that bad I (personally) would take a two step process: (1) Ask the admin to loosen up the restriction and explain how his extreme limitation is absurd, and maybe ask him to loosen it to 10 blocks away from the player. (2) If that fails... tell him good bye and find another server.
It's the best survival server I can find. Also, it's reasonable that cracked servers have high restrictions.
Anyways, I think the hopper minecart + dark farmland method is the best atm...