I don't see a problem with it - but I would make it clear in the ride description that that's the kind of route. I know for our higher traffic urban rides, there's usually a warning (i.e. not suitable for kids or total beginners - should be comfortable riding in traffic, etc.).

Kudos to you for trying to do a different kind of ride - I find that when I get left by (much faster) riders, it's kind of demoralizing.

CA