You should just be able to change the SPL back to what it was originally and flash the factory firmware and be good to go. Do the factory activation after you flash *228 or whatever it is.
There was a filesystem change between 4.3 and 4.4.2 but if you are just flash 4.4 you should be fine. Just make sure to follow the appropriate flashing guide.
If there were any other specific changes you had to make when changing to Page Plus in CDMA workshop you may have to revert those, but I don't think there really was.