Even if we considered the idea, there are two hurdles to overcome.
First, the acquiring team has to have cap space, or make the space.
Second, Gallagher has to be willing to accept the place he is being sent to.
So forget Winnipeg, Arizona, Anaheim, Vegas, Tampa, Florida, Calgary and likely many more.
The acquiring team will be one with a short compete window, who thinks Gally's grit will help, and who have a contract to send us back for one or two years, hopefully a player we can use on the ice and who might fetch a pick of some kind in his final year.
Does such a trade partner exist?