It would work but you might find a lack of front end grip, epecially in the wet and exiting corners. I think newer cars have thicker bars because they are heavier. They feel stiffer because the shells have less flex in them.
I may be (quite possibly wrong) in my last 2 points and I am sure someone will correct me if I am.

PS
You will get a better feel in your sierra by replacing bushes and dampers for uprated stuff-but you already knew that!