deleyt - your statement about the 1 pixel addition being taken from the previous character is correct. I narrowed the zero character by one pixel to both make room for the one modification and make the zero appear slimmer than a capital O.
And yes, redoing the entire font scheme would probably lead to issues with text spacing within the default screen windows. That's another reason why a total decryption of the format would be helpful to determine whether sizing, kerning and other regular font features could be used.
Thanks for the information about the font coloring. Any additional insights on the resource file structure would be appreciated.