Powder will also build up into the spoke/nipple holes so will have to be either masked off or cleaned out defeating the object of using the service.
Hard anodising is probably the best option. Also get the rim done, because the spokes seize into the rim. My wheel builder said spokes often have to be cut and knocked out due to electrolytic corrosion of the aluminium.
If I can get into all nooks & crannies, my hubs are going to be paint stripped, etch primed and painted without stripping the wheel. I might get it Biostrip dipped if it wont accelerate aluminium/stainless corrosion. After painting, a marine anti corrosion product or even linseed oil in the spoke holes might work. That wont do anything for rim/spoke corrosion, so long term it will have to be stripped and anodised, probably with new spokes.