Enchantment Bonus to Specific Weapon - Only when Raging

My Pathfinder Bloodrager (Barbarian & Sorcerer) attacks with both Unarmed Strikes and their Natural Claws. I have an ability that increases my bonus to my attack and damage but, to only my unarmed strikes, and only when I am raging. Now I would like to write a macro to insert into buff 5 and/or 6 to do this ( Furious Enchantment for anybody interested) When the wielder is raging or under the effect of a rage spell, the weapon’s enhancement bonus is +2 better than normal. I want to add it to this attack (I'm showing everything for full transparency) If this was +2 to Attack and Damage to all of my attacks, this would be easy but, it only applies to my Unarmed Strikes, and not my claws. What Macro can I insert into the Rage Buff?

I've only just had a quick look at the sheet and haven't played it before... so this might be a dumb idea. Under the buff settings there is a Bonus field.  This has some options down the bottom like customa12. Are you using these for anything? If not, set the damage to 2, use one of those custom fields, then throw @{buff_customa12-total} into your extra damage field under Unarmed Strike. Provided that custom bonus isn't being used for anything else, it should only give a +2 to Unarmed Strike, and only when the buff is ticked. These custom types may actually be used by the sheet for other macros so this could buff something else it when it shouldn't! edit - Ziechael is lurking... you're probably about to get a far better response.