If you're in no hurry it may help to smear grease on the outside of the hub boss joint, re-assemble and let that work in for time. Over a bit of time the grease will creep in kinda like penetrating oil.
Here in the northeast USA rusting of parts is a big concern. Before assembly of brake drums or rotors I always apply a very thin coat of regular grade NeverSieze to any matching faces. At first I worried that it might migrate out onto the braking surfaces. After applying a thin coat for literally decades now that has never been an issue so I no longer worry. The NeverSieze always stays where it was applied. It really helps for future disassembly.
vic