With only 5 concierge and 18 value rooms, it would not be possible to adjust them such to such an extent that they will be as easy to book as the other room types. Every owner at Jambo and Kidani can try to book those rooms, and there are not many of them.
They want the opportunity to at least offer you a sale, so yeah they don't really do open house type of showings very often. The only one I know of that is routinely available is the model cabin near Pioneer Hall, but they will probably still expect you to sign up for a tour to go in. Unless your guide is based in CA, you can book a time with your guide when you're visiting to look at the model rooms. We used to do that when we were visiting, and still do as new resorts come online. But he knows we don't plan to add on more points any time soon - but of course if we ever do, we'll call him.