Not sure how you could play Al & KG together and not get eaten up by the top bigs in the league. I think if you brought Al back, KG would have to be moved.
I like the idea of an inside scorer but you can't win in the playoffs unless you can get stops.
That being said, I wouldn't be opposed to moving Perk in the right deal. He & Rondo on the the court together late in games is a liability offensively.