First I want to confess that I don't understand why anybody really wants an automatic transmission in a car they have to drive themselves. But - humans are a diverse bunch, so, whatever.
Second, this may not be realistic but what are the options for taking a 123 body and making it into the car you want? Is it too old engineering wise? Anyway I've been thinking about that. It's a very good looking car and set up with independent rear end suspension already - seems like all the other stuff is just time and money. Wonder what motor/manual trans options would work fairly easily.
All the best,