I'm not very familiar with the roads, we normally boat to Westport, not drive. There is a member (brucew) on here who has a cottage in Westport, he may be able to help you out more. Perhaps send him a PM.
I believe hwy 38 is in decent shape, but I'm pretty sure the others are not in great shape and won't have any kind of paved shoulder. Because of the terrain in that area, the roads tend to be windy, hilly & narrow, so a lot of blind spots for cars. If you bike on a quiet day, it should be OK traffic wise. Hwy 38 you may get some transports.