I think the problem with your plan is the team feels they are too light and small.
Klingberg, Daley, and Goligoski are all small. Benn's pretty average. Jokipakka has decent size, but he doesn't play a physical game. Oleksiak's physicality is improving. Demer is willing to throw his wait around, but he's still an average sized defender. Nemeth is the only sure thing, big tough defender.
Both Nill and Ruff have talked about wanting a large, minute munching, physical D who can play in all situations.
I'd personally like to see them have a more even mix of size and skill. If Klingberg and Demers are going to fill two of your rolls of small defenders, I'd hope Nemeth and Oleksaik get a serious chance to be the other side of the coin.
That would leave Daley, Goligoski, Benn, and IMO Jokipakka competing for the last cerebral, softer D spot. Eventually, you'd have guys like Honka, Lindell, Bystrom, and maybe even Hansson push for a similar role ... maybe even edge out a guy like Demers.
When you look at the names Dallas has been tied too, they're big, physical D. It's been Boychuck and Phaneuf primarily. It's guys that are big, but they can play an all around game.
I just think connecting the dots, that's where the team's head is at. I don't think we move forward with a mostly undersized / average defense.