For some reason my brain just appended the concept to your idea sorry for the miss-attribution your idea apparently made me think of the simpler method ie using damage resistance.
That's fine. I was thinking of suggesting an option with BRV granting resistance. I try to suggest house rules that are small changes wherever possible. However, BRV is incredibly complicated, so the usual argument that small change house rules are better because they keep things simple doesn't have much force.
The consistancy of not worrying if the damage is ranged or not is good to my thinking as well... and a perk for the DM and character alike.
The proposal you quote only gives the BRV Resistance against melee/close attacks. I remove the restriction of needing temp HP to get the BRV's bonus damage, though (which means that you don't have to worry as much about ranged attackers). If you want BRV to give resistance to all attacks (this includes ongoing damage, which becomes more and more common at higher levels), you probably want to tone down the maximum amount of Resistance you can get.
For example, you could do this by taking my previous proposal and reducing the Resistance added by the feats.
Battlerager Vigor: You gain Resistance (1+ Con mod) / 2, minimum 1.
When wearing no armor, light armor, or chainmail, you gain a +1 bonus to damage rolls with melee and close weapon attacks. This bonus increases to +2 if you’re wielding an axe, a hammer, a mace, or a pick.
Feats:
Improved Vigor: Change the sentence on Battlerager Vigor to “If you have the Battlerager Vigor class feature and are 11th level or higher, increase the Resistance it grants by 1 (2 at 21st level or higher)
Dwarven Stoneblood: Change to a Paragon feat: “Add one half your Constitution modifier to the Resistance granted by your Battlerager Vigor. This does not stack with the Improved Vigor feat.” Note that doing the calculation out shows that a character with Dwarven Stoneblood gets Resistance from Battlerager Vigor equal to his Constitution modifier.
Compared to the previous proposal, this one is even easier to run because the Resistance applies to all attacks. I reduced the Resistance that Improved Vigor grants by 1 per tier and made it not stack with Dwarven Stoneblood.