Get an Ambi-catch, and a BCM gunfighter CH. I'm looking to try the new Badger Ambi Charging Handle with right sided latch to see how it works. Tried the ACLM charging handle and didn't like it because it didn't have a long enough latch. With the large windage knob on my sights, I couldn't get to it very well. It works fine on my A2.
Trying to make AR's southpaw friendly takes some doing, practice, and a change in standard operations.