A trophy shop could engrave a plate for you.
A (vinyl letter) sign shop could cut some lettering for you to apply.
If you need the lettering on a straight line, no problem. Lettering that follows an arc can most likely be accommodated, but the operator might need to study the owner's manual.
They aren't mind readers, though.
You will need to mock up what you need, provide photos of what previously existed, lettering size, etc. It doesn't have to be permanent, but it needs to be an accurate depiction of what you desire.
I found this website in a few minutes:
If you could create what you need, even as a kludgy "cut and paste" with cut out letters, packing tape, etc. you could put it in place, and have the steadiest hand in the shop use a carbide burr and a die grinder to engrave the lettering (cutting through the paper with the die grinder) and either live with the result, or do it deeply enough to allow filling with a paint stick. The paint stick / lacquer stick method was used on typewriter scales.
