If you're not already committed to panel labelling... I've had really
neat results using custom Letraset. I don't know if you have this
stuff where you are -- it's rub-on lettering in sheets. Anyway, they
also do custom sheets. You upload your artwork and they send you a
sheet of transfers. Brilliant stuff.
It's not cheap -- about £75 for an A4 sheet -- but then again it's
probably a lot cheaper than custom engraving, say. I fitted all the
panel lettering, warnings, reference speeds, lines, boxes, placards,
etc. onto one sheet.