Hurling enemies, rules and enactments!

[Ragedeluge]

Alright I've searched quite a bit regarding throwing enemies as an improvised weapon, only to find homebrewed rules that vary greatly. From what I can tell the mechanics regarding damage and distance of throwing an enemy are simple, it's the method of getting there that I need help with.

Starting with what I can make sense of. Lets say I have a level 12 Barbarian, in the case of the character I intend on playing this is Gestalt, combined with 12 Alchemist.
22 Base Str
Raging and Mutated, permanent enlarge person for a grand total of 36 strength and large size.
Feats: Throw anything, catch off guard, improvised weapon mastery.

Rage Powers for throwing: Lesser, regular and greater hurling.

"Hurling, Lesser (Ex)

Benefit: As a full-round action while raging, the barbarian can lift and hurl an object up to one size category smaller than herself with both hands or two size categories smaller with one hand as an improvised weapon with a range increment of 10 feet. This inflicts damage as a falling object plus the barbarian’s Strength bonus. This damage is halved if the object is not made of stone, metal, or similar material. This is a ranged touch attack, and the target may attempt a Reflex save (DC 10 + 1/2 the barbarian’s level + the barbarian’s Strength modifier) for half damage. The barbarian may apply Power Attack to this attack as a one- or two-handed weapon, as appropriate."

Regular Hurling states as Lesser, except in 20' range increments OR one size larger.
Greater Hurling states as hurling, except in 30' range increments OR two sizes larger.

I've looked through different areas, if you were to be thrown you'd take falling damage per the distance thrown, and do damage to an enemy or object you hit as a falling object going that distance.

As a large character if I throw a medium sized enemy, 30' increments, thrown weapons max at x5; that's 150', falling object damage doubles at 150'. In this case the squishy thrown enemy will do half of 6d6+strength and take 15d6 damage from the distance thrown.
A large character can be thrown 100' for 4d6(/2)+str and take 10d6.
And at maximum a huge character can be thrown 50' for 6d6(/2)+str and take 5d6 damage. If the barbarian utilizes the hurling archetype he can increase the thrown range increment by 10' per category.

This all makes sense to me, roughly. What needs clarification, perhaps even creation; is how exactly does one initiate the said throw of an enemy? Many have suggested grapple and pin; which is what the rage power body bludgeon utilizes to bash enemies with other enemies of 1 size smaller, which could be a very nice combo.

The issue I see is hurling is a full round action, maintaining a grapple is a standard or at best move action which counters my attempt to mash that idea together utilizing body bludgeons rules. If we were to take hurling's wording of "As a full-round action while raging, the barbarian can lift and hurl an object up to one size category smaller than herself" could we presume a calculated effort that equals picking up an enemy? Such as a CMB for specifically that desired effect, considering there are CMB's for everything else. Or perhaps an addendum stating if grappled, or pinned hurling can then take place?

Common topic is brought to bullrush (pushing not throwing), repositioning (still not throwing), ki throw (trip, knock prone, and bulrush pushing).
Giants have the throw rock ability, which seems to follow it's own rule set and our average party member cannot be a giant.

I'm attempting to make this work with mostly RaW and a generous amount of RaI :D"

[Flames of Chaos]

As far as I can tell, body bludgeon and hurling could work, though you would need the Two-handed Throw feat to start:

Two-handed Thrower (Combat):
Two-Handed Thrower (Combat)

You hurl weapons with both hands and with great force, sometimes using a whirling technique to send your weapon flying through the air at tremendous speeds.

Prerequisite: Str 15.

Benefit: Whenever you use two hands to throw a one-handed or two-handed weapon, you gain a bonus on damage rolls equal to 1-1/2 times your Strength bonus. Using two hands to throw any weapon requires only a standard action for you. If you also have the Quick Draw feat, you can throw two-handed weapons at your full normal rate of attacks.

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So maybe also quick draw to take advantage of all your iterative attacks? Also, just a quick head's-up about Catch off-guard; it works for melee only. Kinda surprised me the few times I tried to use it. I only point this out because you have it listed as one of three feats, which suggests you're using it with the thrown attack Hurling gives you.