Well, if your forces are 3d driven and you want a proper look in 3d space then there is no proper look in 2d space were you don't have to alter the forces or the objects as you're just dismissing one axis. The same would apply if you would go with an orthogonal projection.
I don't know what you're exactly after but i somehow guess that without faking you won't come anywere and i'm asking myself why you just can't stay in 3d space and choose a pleasing camera perspective instead?
I don't know what you're exactly after but i somehow guess that without faking you won't come anywere and i'm asking myself why you just can't stay in 3d space and choose a pleasing camera perspective instead?