Galchenyuk has never hit 30+30 in his career, so you're wrong there. Myers is also better than you give him credit for.
What Galchenyuk has proven so far in his career is so far off from Scheifele and Trouba's league. A second line winger with below average defensive abilities carries way less value than a center who just had a full PPG season (and not 0.9 PPG in about 30 games, which every Habs fan seems to rave about passionately) and is defensively responsible, or a defenseman of his age who is a 1D in today's league and still has room to grow. Little is also a better player for us to have, as Galchenyuk has neither proven to be better than him, nor to be a center in the NHL.
We don't need to add a player like Galchenyuk to be good. That's why we would not entertain your offer for a second.