I would think Copp for Dumba straight-up would be pretty attractive for Minnesota.
First, they need centres, with Eriksson Ek being the only decent one they have locked up. Copp as a utility player would have value for them. He's good defensively and they can use him on the wing too and/or in the top 6 if they want. They likely want to bring in a star 1C (maybe this ends up being Rossi) and then have Eriksson Ek at 2C and Copp anchoring their 3C kind of like how Lowry does for us. But in the meantime they can play Copp at 2C or on the wing in the top 6. They have the cap space to extend him, especially with Rask likely leaving in free agency and Dumba heading the other way. Even without an extension, they'll only have one less year of control on Copp than Dumba.
Then expansion draft implications. Spurgeon, Brodin, and Suter all have NMCs so if they go 7-3-1 then Dumba has to be exposed. Parise and Zuccarello also have NMCs so if they go eight skaters to protect Dumba then Spurgeon/Brodin/Suter/Parise/Zuccarello/Dumba/Eriksson Ek and Fiala/Greenway are protected, and you lose Fiala/Greenway for nothing. Rumour has it Seattle is playing hardball with teams and it'll probably mean the Wild will have to gut their team to protect all of Dumba/Greenway/Fiala. Considering last time they gave away Tuch and what he ended up becoming, I think they'll try to avoid doing something similar. They're sort of the inverse from us, where they have weak forwards and strong defense and can stand to trade a defender for a forward and then protect that forward (similar to how we can trade a forward for a defender and then protect that defenseman).
If they trade Dumba for Copp, they go 7-3-1 and Parise/Zuccarrello/Eriksson Ek/Fiala/Greenway/Copp/Foligno are protected and then likely they just lose someone like Rask (which actually helps them open up some cap for Kaprizov/Copp) or a UFA like Johansson. They have Calen Addison on the way to replace Dumba soon too.
I think Dumba is done in Minnesota for sure, the only kink to my proposed plan is they probably will try to trade him outside of the division before sending him to us. We're rivals, but we're good trading partners IMO