Well, you want specific answers and there are actually many. Just find one that will accept a top-pull cable routing and you're done. I have some $4.00(seriously) shimano thing thay can be used top or bottom pull and I've had it on every bike I've had for the last 3-4 years.
Not science, just bike parts. Got to bike shop, ask for a top-pull derailleur, get over charged for it, mount it, ride it.