I'd buy a big rubber fish from
amazon, when they walk in the door, I would Scream at them, THIS IS MY SMACKEREL, then you smack them in the face and yell, PLO BITCHES!
Then 2 hours later when they start bitching about having 8 outs and missing, or floping the nuts and getting rivered, you remind them, its not as bad as the Smackerel.
The other less popular option is you deal everyone 5 cards to start, then you make them throw 1 away before the flop, after the flop and after the turn. Its holdem rules, but it gets them use to multiple cards. We call this game Thermo-nuclear Armageddon Pineapple. After an orbit of that, you play God's Game, which is double board Omaha. Everyone is going to feel a little overwhelmed. Then you say, okay we can dumb it down a little, and deal 4 card PLO, no one will complain because its an 'easy game'
Next time I'm going to have to charge for this kind of quality info...
https://www.pokerchipforum.com/threads/how-should-i-introduce-plo-to-new-players.111001/post-2289397