[TenTec] Push buttons for OMNI V/VI

[A R]

Does anyone have any "spare" pushbuttons for an OMNI V or OMNI VI? I have a need for the "REV", "A=B" and "A/B" pushbuttons. Checked with TT, and they can't help. The silk-screened legend/characters on mine have been worn off by the former owner(s). Failing to find these pushbuttons with legible characters, I may pursue the possibility of having a trophy engraving shop engrave the pushbuttons so the characters can be back-filled. But don't yet know if there's enough material thickness to do even a very shallow engraving depth. Anybody tried engraving these pushbuttons?
Thanks es 73,Allen--W7GIF