Fists SWEP - Specific left/right third-person animations?

I’m making a variation of the fists SWEP where the punches alternate left and right while holding left click. This works fine in first-person but in third-person the only animation I can seem to get working is PLAYER_ATTACK1 which seems to do left and right punches in random order.
Any help?

I don’t think you can control the 3rd person animations like that, at least I haven’t found a way.

Damn, that’s a shame if true…