I've been looking for a similar solution. After some research I still haven't found any better option than keycap stickers. You can opt to have key caps custom printed from
at $10/ per key it seems a bit steep.
I have noticed that Editors Keys makes a better looking keyboard for premiere cc
If you found a solution I'd love to hear, hopefully this helped
I have a Brother label maker connected to one of my PCs which I use to make custom labels for keys because I use a key remapping utility.