Having read a bit more and understood that there is little to no chance of doing a Planescape game or any other sequel without going into the same problems you are hoping to avoid via kickstarter, I'd like to just note the bare crux of the matter, what most people agree is what we want.
An oldschool, isometric, story-heavy, well written RPG, if possible with a proven-to-work combat system (whether from a p&p RPG, or wherever else you can find one.) I think we can agree on this, no? And frankly the details are better left to, y'know, people that do this for a living.