Thanks for all of that! You made a lot of great points that I think are easy to overlook, especially because a large amount of learning another language is the nuts and bolts of that language. I agree with you about not teaching grammar; in fact, I don't think it's necessary to ever teach it. I also agree with you about learning on your own. The point of the consultant would be to encourage this self-study. Rather than tell you what to do and how you "should" do it, the consultant would give you tips, advice, materials, resources, guidance, etc. for you to then have for your own self-study.
I'm particularly interested in your suggestion about having the consultant discuss the culture with you, though. What kinds of cultural information would you look to learn? Also, what if the consultant provided you with resources that could be useful to you both from the language and cultural sides simultaneously (i.e. learning the language through culture-based material)? Would you like to see more of this type of material accessible to learners, particularly learners who teach themselves?