Hmmmm, great question Zepper. I have the same desire to upgrade, and same theft concerns, and thus wanting to keep the unit looking stock and less desirable. Didn't think of swapping with a Mustang or other Ford unit. From the interaction I've had with the dealership here in Reno (terrible), I am assuming that this compatibility question would be even more daunting to them. Seems like it would be a "trial and error" process. Would be great if we could find a auto wrecking yard that would allow returning a unit until we got one that worked. I'd even be willing to pay a reasonable "restocking" fee in the end, regardless of success or not.
What do you think? Have you scoped out any of the other Ford units?