So I think HP Restore IS the way to do this right now. I legit can't think of anything else that will protect my units from close to 100% OHKOs.
MP Switch - Only helps the first time. Might get to take 3 if the unit's HP is high enough. MP - HP - HP. Rare, so it's mostly just 2. MP and HP
Defense Up. Not enough protection
Auto-Potion. Where is my Auto Elixer!? Kidding aside, 150 HP isn't going to help me here.
Critical Quick. I guess this could work pretty well. Take a hit, get an Auto-Turn, and kill the next Chocobo up. Repeat. Need to be able to reliably kill them in one shot, though, and I don't have the Move like them. Even with Move +3 and Teleport [luck based outside your range]
Dragon Spirit could work the same as Critical Quick. Once they get back up I could kill the next Choco up.
Meatbone Slash/Split Damage - Meatbone Slash would be better, I think, but I could give both some thought