[Wauthan]

Yes, Luck 3 will greatly increase the chance for a hero unit regardless of the order/turmoil scale.

I don't think it's worth taking luck 3 for the sole purpose of attracting hero units though. Even with Turin's hero mod they are not worth 120 pretender points. It's far better to go for Turmoil 3/Luck 3, especially with Pangea, since this means you get lucky for "free" and your Panii will attract quite a lot of Maneads.