As a Sabres fan I would do something like this.
Sabres get Kane and Keith.
Hawks get:
Jeff Skinner
Brandon Montour
Any prospect in the organization other than Cozens.
1st round picks in 21' and 22'
Another prospect/pick or two
The Sabres would have to convince Skinner to go to Chicago. I think he might be willing though, because being part of a rebuild where there aren't high expectations, and you can just sit back and collect your dough, while playing the puck hog, no awareness type of game is something Skinner I think would be into.
The Sabres give up a lot but if we don't make the playoffs this year or maybe next, we are going to get a ton of assets to rebuild with from the Eichel trade. Seriously, the Sabres can't just wait here. If the Sabres don't find away to turn this around soon, they will be heading to another complete rebuild where Eichel and Dahlin have moved on. Dahlin I think would flourish on another team.
For the Sabres, the trade would give them a lot of cap flexibility in a couple of years. They rid themselves of Skinner's albatross and after this season there is only 2 years left of Okposo. Hall-Eichel-Reinhart, Olofsson-Staal-Kane, those would be your top two lines. Keith though far past his prime I think would bring some balance and stability to the defense.
For the Hawks, they take on one of the worst contracts in hockey in Skinner but if they are about to rebuild, there will only be 2-3 years left on the deal when they are ready to compete again. Jack Quinn or UPL I suppose would be the prospect, then 2 firsts and other assets, from a historically bad franchise at the moment is a decent haul. Montour can be traded at the deadline for assets.
I am honestly not sure if this value is there but I think it is pretty good.
I know Sabres fans may be aghast at the amount I would be willing to pay, but like I said, if they don't do something drastic to turn this thing around, they will be heading into another rebuild and 10 years after the tank, Eichel will have come and gone while the Sabres are in a full rebuild again. I think a type of move like this could change the fortunes of the organization.