Using spoke intervals is fighting the problem. If one is going to use a counter that counts full wheel revolutions, it makes sense to have the rim marked to give original data in decimal form.
It took me about 1/2 hour to mark my rim the first time. If I had to do it again it would take about 15 minutes.
Ever since I did this I have enjoyed decimal readings, which are far easier to use than 1/32 or 1/36 spoke intervals. Sure, you can overcome the uneven fractions with computer trickery, but why not start with the right tools?
Mark your wheel. You will not be sorry.