The program RC is freeware, and the writer is Diomidis Spinellis. I used it as a titling machine of my MDS 303. Therefor I wrote the script RC.MD6. If you think you have a better script, I would like to receive your version.
All alphabetic characters work, as do the numbers.
In that case, you can use the rotary control for that character. Left and right arrow are used to move in the character string. This will do it.