I have a touch screen that has its own firmware where I can change things, maybe a search would reveal one for yours. I load it on an SD car and boot it up, reads it and updates it from there. its a TFT28 fyi
One wish list item to add: A “sticky” completed print time. It’s nice to know how long it takes for a specific print. The clock is nice but it would help if the previous print time remained on the screen until a new print is started.