The commander rank already made it to the Craig era; having him in uniform wouldn’t do any more damage, or cause the average audience member to probe what a naval commander does. I also would like to see it.
What marred SPECTRE for me, chiefly, was the retcon overreach. Trying to tie the previous three films together in ways that weren’t entirely successful. Didn’t Silva himself exclaim that he “chooses his own secret missions”? Doesn’t sound like a loyal, true blue agent of SPECTRE – an independent contractor whose interests aligned with theirs, thereby securing funds, weapons, and manpower from them for the project to assassinate M? Sure. Likewise, Blofeld being a meaningless alias tied only to his “mother’s bloodline”, as opposed to, say, his being the bastard child of young Miss Blofeld and her Greek lover Stavro, who was deemed unsuitable by the family, who quickly & discreetly married her off to Mr. Oberhauser, who changed the boy’s name. I’m just saying it’s not too late.
More importantly, make him a real threat, someone the audience will love to hate.