No need to deselect the terrain function, the EGPWS system does not use FMGS airfield data, it has its own internal worldwide database that contains every hard runway longer than 3500ft.
You will only get LAND mode (without which there will be no autoland) if G/S mode is showing on the FMA. This can only be engaged by pressing the APP p/b and will only engage if an ILS approach is present in the active flight plan. As long as you have that, as far as I know, the frequency can be manually changed and you will still get G/S then LAND annunciated and an autoland will follow. You are going to get an ILS/RWY mismatch message but I don't think that will prevent G/S engagement.
With no ILS in the flight plan you will only have HDG and V/S available to follow the ILS and no autoland.
Last edited by Max Angle; 30th Jun 2016 at 18:46.