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A warpriest can get vital strike at level 6. For enlarge person they'll need the dreamed secrets feat.
A sacred servant paladin gets a domain, the strength domain includes enlarge person. They'll need a +1 training (vital strike) weapon until next level though.
A duergar gets enlarge person as a racial SLA. Any full BAB (or similar, like warpriest) class which gets a bonus feat at level 6 can get vital strike - fighter, obviously.
An occultist with the trappings of the warrior panoply can use their weapon/transmutation implement for legacy weapon to get training (vital strike) and can get enlarge person as a spell known.
The better combination over all is the Accelerated Drinker and Enlarged Person Potion. This makes Enlarge Person a move action instead of a Full Round and with Being a Follower of Gorum u get Lead Blades as a Spell.
Or a Barbarian with the Drunken Brute archetype. (This archetype stacks with Invulnerable Rager.)