Becoming a Demon: The Guide (?)

[Slithery D]

I always thought the easiest way to become a demon was Planar Binding + True Mind Switch.

Okay, you don't get all the cool abilities, but you get enough along with some hefty physical stat boosts (assuming you're the kind of scrawny wizard and/or psion who would be able to use Planar Binding and/or True Mind Switch).

I used to think this and there's no explicit rule against it, but when you think deeply about the fact that Outsiders have a unitary soul/body you realize that strongly implies that you can't separate or switch the mind/soul out of an Outsider.

Are there any examples of an Outsider using Magic Jar except for incorporeal variations like the Shadow Demon? They really shouldn't be able to, if I'm right.