greater weapon focus bypass restrictions?

[thkiwow]

I decided to split wenduag to become a level 4 fighter and a level 16 hunter, using the fighter levels so I could get more feats and greater weapon specialization for extra damage. however the greater weapon focus feat is really great with the mythic.

planned distraction gives you an overrall bonus to attack rolls if the animal companion is attacking an enemy. to +2 at 12th level. considering greater weapon focus and mythic gives a +2 overral, it's not a loss. but still... even better, there are plenty of other buffs you can use as spells to up your performance. having a low wisdom value is not that bad since she could just use a headband and solely apply buffs.

having a fighter at level 8 will reduce the animal companion's level by four, after taking boon companion. but keeping wenduag as a level 12 hunter is not really that bad of an option here... are there any classes that give you fighter levels like hunter or ways I could up her animal companion's level by another 4 asides from boon companion? because I already plan to take it...

[Immortal Reaver]

I think there are only 2.
Eldrtich Knight - from lvl 1
Magus - from 10th level he counts half of Magus levels as Fighter levels for feats, it stacks with Fighter levels.
Arcane Rider has it too so that would continue mount. But you wold have to get 14 lvls of it to get it, making her mostly Magus.