I can't say I like the idea of the Monza drill attachment one. It won't give you anywhere near the amount of control that a proper machine would.
As for hiring, it seems like a good idea, but I don't think you can beat having your own kit and having it to hand whenever you need it. What happens if you break it, or the previous user has left it on its last legs? They don't tell you what they'll do to you if that happens.