I use a system in which the "planes" aren't actually different places, but different modes of existence within the same plane. The "Material Plane" is simply the way that organic, living, mortal beings happen to perceive and participate in that reality. The different modes/"planes" are loosely...
(Sorry to be responding so late, didn't see this thread before.)
One method I've experimented with, that might work if your players aren't too "hack & slash", is to treat any attempt to resurrect someone as a role-play challenge. Rather than just chanting over a corpse or whatever, the...