Being that the knuckle is aluminum, and the hub is steel... It causes galvanic corrosion.
Don't use "Never Seize". It will act like a glue. If anything, use a propane torch to heat up the knuckle. The knuckle will expand... and at some point you will be able to beat the hub out from the back side, since aluminum expands more than steel.
Clean up all "mating surfaces" using emery cloth to get rid of any corrosion.
I found some hubs (for a Jaguar) on Rock Auto a while back. The outside diameter of the hub body was a bit smaller than the knuckle. They were pretty much "drop in".
I forget the brand name.
