Obvious mitigations for safety:
Do not sell any food or drink in the away section. No one will die if they can't have a drink for 90 minutes and the absence of food/drink containers gives them less to throw.
Do not sell the first five rows of seats and rope them off. Eject anyone who crosses the rope.
Keep aisles clear and employ enough security staff/police to ensure this.
Anyone jibbing in is spitting on the memory of the Hillsborough dead. Therefore they should not just be ejected but prosecuted, and automatically banned from the Etihad for life with a court injunction against them.
Yes, this would be costly, but fuck it. Safety is paramount and the only alternative is to ban LFC fans altogether.