That's a low down, dirty, and excellent idea.

As for the question of the galactic wind - I believe they do. I'm not an expert on that, but it does seem to be the case that there's an overall wind of charged particles throughout the galaxy. Now they'll be both electrons and protons as all stars emit both. In general that means that the overall galaxy is still neutral, however at the particle level the wind is charged. So yo have a movement of charged particles. You also have an overall magnetic field in the galaxy - so charged particles that come into the galaxy from elsewhere are deflected by the magnetic field and don't travel in straight lines. Initially it was thought that the galaxy has a very disordered magnetic field, but more recently evidence has been emerging that the galaxy might have quite a structured magnetic field on large scales. This means we might be able to see a very high energy cosmic ray hit earth (that must come from something outside out galaxy) and track it back, plotting the expected bend from it's passage through the magnetic field and figure out where it came from.

So yes, there is a galactic equivalent of the solar wind. There's certainly an interstellar medium of charged particles and the solar system plows through it with a bow shock as our solar wind hits the interstellar galactic wind (just like a boat forging through a lake). There's also a large scale galactic magnetic field that is intimately connected to the galactic wind. This affects all charged particles to travel through the galaxy, making it hard (but not impossible) to track a charged particle that hits earth back to its origin.

@Jaxilon: You're right that people believe the earth's magnetic field flips over time. The field is caused by the spinning iron core of the earth. Apparently that changes over time which causes the poles of the earth to wander. However there's certainly no fusion at the core of the earth. If there were then we would be a star.