You're building a "custom content" server...

[Piercesyu]

Just add Planes of Power zones, without Plane of Knowledge and with the proper zone connections that should have been there on release.

Plane of Nightmare entrance inside the temple in the fire ring of plane of fear.

Plane of Disease entrance on 2nd floor of plane of hate.

Plane of Storm entrance on 8th island of plane of sky.

Plane of Justice entrance ?

And then 2nd tier zones inside the 1st tier zones and so on.

No extra levels, no AAs, just the new gear with level required 60.

To be honest I probably read that zone connection pattern somewhere here, still the best idea I can come up.

That and server wide resets every week, or two weeks, or montly.. At euro times. =)