I agree that it all depends on if Trouba stays. We'll find out this summer and assuming Trouba stays, Myers could be moved. To me 9th overall would be the type of return I'd hope for. Even if it means the Jets add to get there as suggested by the OP. We have so many wingers we can part with some:
Connor - Wheeler
Ehlers - Laine
Perrault - Roslovic/Copp
Tanev - Armia
Vesalainen coming and looking really strong, Appleton and Petan burning up the AHL, Dano, etc.
Depending on the add there could be a deal to be made as Poolman looks like he's already a serviceable bottom pairing guy with potential for top 4.
at 9OA you could maybe get Bouchard/Wilde/whoever to fill in the RHD pipeline as a potential Buff replacement down the road.
Would free up space to take a run at retaining Stas on a short term deal and allows us to lock Helle, Morriessey and Trouba all up long term.