you’d have to make the assault frigate skill available for alpha clones this way alpha clones can enjoy the party for raid game play mechanics
Sorry, but unless CCP dramatically changes their monetization strategy, they wont happen. Alphas are stuck in t1.
As for the other idea, there’s no point in changing the general idea of what an assault frigate is. (And no, fighters don’t fill that role.)
That said, there is a potential role for a ship line around orbital insertion, assaulting structures and other ships. That will have to be after structure / ship interiors and planets are added to the game though. Months ago, I outlined a plan for that here.