I've done something similar, but over Minmus and with something smaller. I launched it with a docking module for my station. The debris was actually supposed to have a probe core onto it so I could deorbit it, but I forgot to put it on. Instead I had to push it, which worked quite well. I was going to make a larger version to deorbit debris around Kerbin, but with the map-filtering in the next update I don't think I'll bother.