Back to the original question regarding what ILS angle can be flown, it is safe to say the one published is the one promulgated by the equipment, thus can be flown at the promulgated angle of 3.20.
The FMC coded angle is NOT used for the ILS as the G/S and LOC signal are followed, thus the check for angle would only be 'required' when conducting a VNAV approach. In case of a NPA, where the angle disagrees in FMC from published, DO NOT USE VNAV but use V/S.