Which is why I’ve kept CS4 installed — to keep access to those great AE plugs that never may be updated to 64-bit. I just used Pete Warden’s HalfTone on a shot, it worked the absolute best out of that handful you mention.
For CS5 you might try Satya Meka’s Dot Pixels pixel bender filter over at aescripts.com. Used that too recently, very nice, you might be able to finesse it into looking like a halftone pattern.