I’m not sure a bar would need all that utility though… Just writing the gcode to eeprom via USB would do it. How often would you want to update the patterns? Do you want to advertise specials or something? Have a rotating pattern for holidays?
Eventually I want it easy enough that once I set it up the owner can edit the ad text and choose the display frequency for them. Perhaps a WYSIWYG text editor for specific fonts in Sandify… I’m thinking you want to do outside to outside instead of outside to center or center to outside for text dumps, and reverse direction when drawing a second line of text. Maybe something similar to strike through, but only between letters, not through the letters.