Most of what was the great wheel was the astral plane and what 4e calls dominions.
So its simple, restore the discarded dominions, have them surround Sigil. Make the astral sea, shadowfell, elemental chaos, and the feywild transitive planes, with dominion planes with in each. So the astral would have the great wheel, the Elemental Chaos would have the elemental planes and realms, and of course the abyss, the shadowfell have dread domians and the negative energy plane, and the feywild has demenses and the positive energy plane, and the material plane has its crystal spheres. The phrenic planes, especially the far realms are beyond true understanding.
So its simple, restore the discarded dominions, have them surround Sigil. Make the astral sea, shadowfell, elemental chaos, and the feywild transitive planes, with dominion planes with in each. So the astral would have the great wheel, the Elemental Chaos would have the elemental planes and realms, and of course the abyss, the shadowfell have dread domians and the negative energy plane, and the feywild has demenses and the positive energy plane, and the material plane has its crystal spheres. The phrenic planes, especially the far realms are beyond true understanding.