If you had one, then an office supply store may be able to print those on a clear sheet? Worth asking. If not maybe a kinko’s or other print shop. I had a local print shop make a copy of clear button legends before.
I have tried that in the past, the ink is never dark enough and just gets washed out when the buttons light or candle..
Like when I brought a piece of glass in a local place to see how much it'd cost to simply print something I could adhere to the glass.. They said $2500 for 3 pieces (top, reel and belly) because in his words "that printing is 2018 tech" and would need to be printed overseas or hand painted..
I didn't say a word, I wide-eyed the guy and pointed at the '1996' copyright date on the piece of S+ glass.. I walked out and tooted the horn when I sped off.