I was thinking along the same lines. It all depends on how much SR you need (something I am not sure of btw).
You could do:
Benchmark:
-Dwarf full CON based OS.
-max CON, level ups CON
-SR for this build is assumed to be enough
-41 pts in OS, 18 in dwarf, 21 in other trees
Option 1
-Human STR based DPS barb with OS capstone
-Max STR, Max CON, Level ups STR
-CON stat 9-11 pts lower than baseline (2 for dwarf, 7 level ups, 0-2 dwarf tree AP)
-41 pts in OS, 39 in other trees
Option 2
-Dwarf Hybrid. STR is damage stat, but max CON is objective
-Max STR, Max CON, Level ups in CON
-CON stat 0-2 pt lower than baseline (dwarf tree CON vs. CON from deeper dive in 2nd barb tree)
-41 pts in OS, 39 in other trees
Which is best combination of DPS / SR depends on what you want to do. I think option 2 might be the winner in terms of DPS compared to baseline because of the FB or ravager DPS deep dive benefits, but you do have a lower damage modifier, so I am not sure.
You could even do option 2 as a human instead of a dwarf if you could handle a couple more pts off of CON.
Speaking of CON, if you really really need the extra 4-8 points of SR, could you dust off the madstone boots for a stacking 4-8 CON? Does that still work?? (I have the upgraded boots, but never wanted to making a barb before lol)
Thanks,
J