LCD display only for typing code

Hello everyone
I started repairing car radio for hobi 
the problem is:
the radio has a code but no display in radio (its have in car display)
and the risk is to blindly enter the code.
whether it is possible make some display to board only for typing code on which the radio will be able to connect .....
display from an old radio CD or DVD player....
Thanks....will be of great help to me