As you may see, I focus on what to do.  I kind of see this as me causing you trouble rather than the other way round, and I have been very careful on my wording.

Duplication is a very minor issue.  In fact, if a bus route does run on a same segment more than once it HAS to be included that many times.  It's not uncommon for a circular route to occupy a segment of road 4 times.