It'd be tough to give up Lundkvist in any deal, he's going to be a very good player in this league. It's just a simple matter of organizational strength. The key will be ensuring that you get a very good player back in the deal. I think Larkin is certainly in that mold.
If you could add Larkin, then flip Zibanejad to Colorado for Newhook, you've got Larkin, Chytil, Strome down the middle next season with Newhook on the burner, hopefully ready to replace Strome after he leaves in 2022. Then perhaps you get lucky with Chytil and he shows he can in fact be that top line center who gets you 60-65 points and you can potentially move on from Larkin before he needs a big UFA contract.
The key for the Rangers is going to be creating a steady pipeline of complimentary players who can work with Panarin, Laf, and Kakko.