I don't think your explanation of fly by wire is correct.
My definition of fly by wire is the pilots control is connected to a computer. When he wants to turn he sends a signal to the computer and then the computer takes over and moves the necessary controls the aircraft requires to do what the pilot wants. This was given to me back when we(Boeing) were responding to an R for P for the B-1 back in the early 70's
Fly by wire has been used by our military many years before Airbus used it.
If you want fly by wire you need to install a computer. Eagletree is now producing a three axis stabilization unit that would do that for you.