This is really old but some dozen of years ago I used to disassemble parts of FF1's menu routine. If I remember well, all 4 orbs are made of 2x2 tiles and fit in a 4x4 attribute square. There was a routine that calculated which orbs were lit and which werent, and calculated the attribute byte. This was hardcoded. By scrapping the routine entierely and forcing a constant value, you should be able to do what you wanted to do.