I am building a second version of my 5-string bass guitar. On the first version I used the Egyptian hieroglyphs for the word: “Exterminator” as fretmarkers.
Now for this second version I was thinking about doing the same but in Klingon writing.
Is it possible to provide me with the right Klingon letter signs for this word so I may use this as fretmarkers?
It sounds like you’re not really asking a question about the Klingon language, but about using a Klingon writing system to represent a word in the English language. As you have already figured out, the Klingon writing system cannot accurately represent the sounds that you wish to write. You could write it as, e.g., ‘eqStermIneytor (but in the pIqaD script which is used to write Klingon), but this does not obey Klingon phonology and nobody else would be able to read it.