You might be able to get by for a while, depending on the setup. Remember, most single color strings are just one strand, in the first place. If yours is one with minimal serving, it won't last long but, if it is one with a ton of serving holding things in place, you might not notice the difference for a while.

If you do decide to "doctor" the string, at least have the courtesy to tell whoever you sell the bow to that it will need a new one.