I definitely would like to see exactly what you mention here. It would probably be way too labor-intensive and the crew is rightfully focused on D:OS right now, but with the games already in my backlog, there's no way I'm touching DC anytime soon unless something like that is added.
I probably wouldn't have picked up DC if it hadn't come as part of the D:OS Kickstarter anyway.
However, I think if DC2 were to ever happen, I might be willing to give it a go if enough devotion to clarity, polish, and responsiveness evident. I know the story behind DC is that it was originally a horribly ambitious finale to Divinity 2 that was taken out and later buffed up and polished, and it sort of shows a little. It just felt a little jerry-rigged in some ways that I find a bit hard to put a finger on. I wish I could articulate it better, but I think DC2 could potentially catch my interest better than DC did, and it probably would make more sense to start fussing with intro/tutorial levels the second time around as opposed to now, as improving DC1 may not give very good return on investment.
