Thanks! I looked at the EXE I have from an ISO and didn't see any offsets that matched what you had, so I'm wondering if the region matters. In any case, I'm going to try and do some texture replacements using your scripts as reference. This is actually my first Outrun game, pretty fun.
Which sz file are the "Time", "Score", etc. sprites in? I didn't see those anywhere when I extracted all the files (re-enabled the commended out lines).