Awesome!, You did was I was going to try once I could download my copy.
I think there's a chance with the x, y and z values. Have you tried to somehow scale in the map, by guessing for example how much distance in the offset values are between for a point to another in the values.
Your first goal, maybe you have already made it, is to move you're character to another part of the same room, then see if you can get it back. You can then measure how much distance teleported from point 'a' to 'b' in the offset units. The objective would be to calculate what coordinate could put you right inside one of the unreachable areas. Maybe by giving in an actual location inside them could make the character bypass the walls and get in.
Other reason is, if the camera have their own x, y and z values and, if it is not warped, maybe that's what is not letting the character go.
There is one weird glitch I've stopped researching. I've called it the "party's leader change glitch". It can be made by padding a savegame, changing 00 values to FF in certain offsets. The party was Light, Hope and Sazh, other configuration didn't triggered it. I have to put Sazh as leader, close menu, open the menu again, put Hope as leader, close menu, open it again and put Light as leader, Light will get warped in the center of the Berserker statue, trespassing it, and the camera will go to where she is, trespassing any walls. So there must be a way to bypass the collision system or, you can actually warp her, giving in a coordinate inside a valid area in the map (that the game considers as playable and not off-limits).
About the Cradle, I've already played around and saw what happened to you. That behaviour is for using a save previous to the cradle's chapter and maybe one too early, as one I have from the first arrival at Grand Pulse would trigger the event where the portals get open and fix the layout. I've even researched further, trying to unlock the 7th gate, and found three bytes (or maybe an integer) that controlls the Cradle layout. I'd believe there might not be a chance to get the portal to go to the 7th, it might have just been overwritten with the Narthex warping code.
The Narthex maybe wasn't planned and, the 3rd portal it's the actual entrance to the 7th, The 7th portal looks like having been placed on the same height of the other portals, not having that little ramp that goes down.
EDIT: This is the full 7th map I've shown on an earlier post:
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