I see things in Vedder that could possibly warrant a 'deceptively Fi-ish' label maybe... but like you allude to there's polish and control there. It's pushing boundaries within 'the safe zone'...which can get under the skin of those of us that live out our days under the influence of heavy doses of Fi...because it will be experienced as entirely fake (it ain't boundary-pushin dude until it's actually pushin-boundaries.)
I should say that it's not like I'm a massive Vedder fan for many of the same reasons you put forth. I'm just fascinated by this thing...this typing thing. To make matters even more confusing for me is the fact that my personal experience of the NFJ is already so far removed from anything I've seen on this site to begin with. In my world NFJs say...'You want boundary-pushing? Oh I'll see your boundary-pushing...and raise it to Evil-Overlord-Dictatorship.' <-Still, there are some common threads.
I have a Pearl Jam video on my wall right now and I'm struck by something that occurs in the very beginning of it. I know from all the history here that the video was filmed in the Paramount theatre...which is small and difficult to light...I guess for its MTV purpose haha... And you see Eddie asking to have the lights turned down... you can tell he is sincerely concerned for how bright it is on the people that paid money to come see the show. <-I know I would not think of that...and I don't think Cobain would either. If I was Eddie Vedder in those moments that would not occur to me to do. And that's the common Fe thread I see. Is it why I think Vedder is FJ? No. But it jumps out at me as something I can point to...behaviors that I see in my Evil-Overlords...that crossover into what we see in the classic expression of FJ.