Just use yourself of gates for no.4
Just make a map in the map maker, but never check the box "has portal" for it. Instead, make gates that leads to the map, and gates inside of the map that leads out of it as well.
As long as you know how 1 gate works, the ones inside the map without a portal in cape works the same. Just place one, put a valid map name in, and the choose the coordinates you wish the portal to place you in the other map.