Should do the warlock thing, only we sacrifice the hunter to empower the pet.
Can't have any homogenization. No siree.
LOL, make it work like divine intervention, for this it will be a BM only spell, however in this case instead of making someone invulnerable, we empower the pet, reduce pet health by 50% and add it to hunters max health (similar to how soul link works, or just make the empowered pets health equal to the hunters max health plus 20%), give it a handful of abilities mimicking whats in the hunters core rotation, IE a bleed/poison like serpent sting, a boosted beast cleave, an instant low focus attack similar to arcane shot (or just buff the basic attack outright), KC, a stronger BW, and a focus regen attack, prob similar to slam. The spell could be eyes of the beast, or something like that. The best thing about this idea, it doesn't get rid of the hunters raid buff utility, except for the 10% attack power aura, although the pet could get that aura added prob. And this would also give those hunters the melee spec that they've been asking for.
Edit. We could keep mend pet as a self heal, not sure how spirit bond would come into play, or some of the other talents/traps, but wed prob lose pet avoidance with this.