1. Open Skyrim.ini in your text editor of choice.
2. Launch Skyrim in a fashion that allows you to alt-tab.
3. Load your game.
4. Alt-tab to your text editor, change
uGridsToLoad=5 and
uExteriorCellBuffer=36 then save the Skyrim.ini file.
5. Alt-tab back to Skyrim, open the console, type
refreshini and then close the console.
6. Create a new savegame, exit Skyrim.
You can now load your new savegame with your newly restored uGridsToLoad=5 settings.