Actually, 1/16 inch is exactly 10 inches in N scale. Evergreens strip is 0.060, slightly less than 1/16, so measures 9.6 inches, or 9 5/8 in fractions.
That's why I've never bought a scale ruler, after over 45 years. Fractions work just as well, and since 1/64 inch is 2.5 scale inches, actually have smaller division than most scale rules.
Back to the question: If I couldn't find printed decals, I'd probably buy a sheet of black "Trim Film" from Microscale, and cut my own. It wouldn't be any more work than cutting masking tape into strips, and with my painting skills, would look a lot better. All trim film is is a solid color decal sheet, so if you only need a little, you could spray paint a piece of blank decal sheet, but the trim film would probably be neater.