Since the position for 0Z is not available in other waveguard equidistant hexagonal layouts. You can review your raw data, then import the electrode positions with the ANT waveguard 64 duke cap, this will update the positions for the 63 channels that are available, lastly you would need to add manually the location for 0Z.
EDIT: Is the position 0Z the electrode for ground (GND)? If so, isn't its time series flat?