The sword & board idea sounds cool for a change! Although, there aren't many exciting shields for Barb out there.
First thing that popped in my mind with the S&B idea though was a LoN fire build using Bash (Pulverize), with high attack speed and Wrath of the Berserker - although a bit harder to get perma Berserker without IK, and, well, LoN builds take some time to farm.
I could also imagine the Rimeheart/Freeze of Deflection dream, but I never managed to get a decent Rimeheart to check how it´d work at higher GRs.
In any case, we could always start with LoN build to tweak and experiment, and see how it goes. Most likely there´s someone out there already trying something similar as well.
I'll share something if I get to a somewhat decent idea/build.