Frost isn't worth a long-term deal, and I doubt he'll take 3C money.
So unless you can get a bargain 2 year deal to buy time for prospects to develop, you're better off using him as part of a package for a young center.
I'd be happy to package Frost, Brink/Foerster and a 2nd rd pick for a 2C 25 or under.
A compression deal at wing to upgrade center.
To me, Michkov, TK, Couts, Farabee, Tippett are the five "top six" forwards on the team.
Then you have Frost, Foerster and Brink.
Followed by Cates, Laughton and Poehling
So if I can upgrade the second group I'd do so.
You can fill in the bottom six with guys like Richard, Lycksell and Tuomaala, then Jett, followed by Barkey, Bump, etc.