There are many proposals on CapFriendly based on Marino for Boeser (or Miller), but on every one I've seen (including ones much more tilted in the Pens favor than yours), Pens fans shoot it down saying Marino is untouchable unless a top 4 RD is coming back (e.g. https://www.capfriendly.com/armchair-gm/team/2999151). After Marino and Letang (who's 34), the Pens don't have much depth at RD.