On my bike I have two different keys to use that look almost the same.
To differ the keys from each other I created an enclosing key cap.

In pictures you'll see a labeled the cap but the files are not labeled.

Theres also a STEP model so you can create your own labeling text.

Note… it's not necessary to glue the key into the cap just put the glue on the outer edge of the caps an put them together.

This way you'll be able to remove the caps by destroying them for some reason