Nah, just aim your capsules along the galaxy with a speed low enough to not leave the galaxy. The capsules will go around the galaxy, travelling through or osc

Nah, just aim your capsules along the galaxy with a speed low enough to not leave the galaxy. The capsules will go around the galaxy, travelling through or oscillating above and below the galactic plane just like other stars. Bonus 1: Make your capsules charged so they're guided by galactic magnetic field lines into star-forming nebula where a high density of stars are created letting them mix into protoplanetary disks. Bonus 2: Just keep spewing out more capsules to increase mixing rates.