As a Canes fan, this doesn't make me happy. I've been thoroughly unimpressed in JK. We took a chance at a cost that worked for us, no harm in that...it didn't work.
I'm rather more in favor of not tendering him an offer at all and letting him walk as a UFA. No point in chasing wasted assets with more assets...I'd rather have the cap space and roster spot than JK.
So if you are treating him like a rental anyway would you look to move him for a rental that is a better fit? The acquiring team would have to be willing to give him a contract that is more enticing than his QO, so probably a team like Arizona or Seattle that has a bunch of room and should be taking chances on young guys like him.
Kessel would be the obvious one if you are looking to trade a developing scorer for a proven scorer, but Canes don't really need a right wing. Crouse would probably be the most interesting target as he is scoring at a similar pace to KK, but he is better suited to lower lines, much cheaper, and RFA without a huge QO.
On Seattle Gio is the big UFA, but again Canes don't really need a LD. Jared McCann would be the best target for the Canes, but Seattle is unlikely to move him. You would probably move him for futures then flip those futures to a different team in that case.