If you don't want to galv it, have it blasted, hot zinc sprayed then powder coated,
Guess it depends on what local facilities you have, and how big a job it is, galvanisers usually have minimum charges, and if not local, transport will need to be factored in, most decent commercial painters can blast and metal spray, at least round here they do, no distortion with zinc metal spraying either,Cheaper just to galvanise first?