Note: Images of printed keys are of me starting my own set using the blanks as a base.
Since there were no options of custom colored keycaps for the Commodore64 I decided to grab my digital calipers and model my own. These are also not an exact replica of the CBM keys in case that's what you were looking for.
These are all of the key sizes needed for recreating the full set of caps.
Any support for me to continue making models would be well received.
I set the spacing for the support to .2mm and it seems to work pretty well. Most of it pulls right out.