when you have steel in aluminum you can mig the broken stud and then weld a nut to it. I do Ford crown vic heads all the time at work. Studs will be broken 1/4" in the head. The mig will not stick to the aluminum at all. Its done in the car as well.

I have to do my 03 Dakota some day, been putting it off as its the passenger side on a 4.7.