If you’re gonna do something “Esterbrook”, you need to understand (or at least have a good idea of) what the “Esterbrook experience” is all about. We know what it is, but from a strictly personal viewpoint. A cold business-like approach to the subject requires, IMO, a different look. Could one boil down the whole Esterbrook experience into a few words that would say it all?
What I came up with were three words: Original, Innovative and Unique. And a cursory look at the Company's history would easily reveal it.
I would also add Reliable and Affordable. Esterbrook pens were not designed to be high end luxury pens, even though IMO they well outperform some of those.
Were I behind a relaunch of Esterbrooks, there would first need to be something probobly stylistically reminiscent of the J/LJ/SJs and definitely compatible with existing Esterbrook nibs regardless of the final design of the pen. I can't think of any other line of pen that was designed to swap nibs like the Esties were, a quality that I think falls under all three of the ones you listed.
Then and only then, after establishing the line, would it be worth exploring a midrange/high range line. I don't see anything impossible in the idea of higher-end Esterbrooks -- they themselves tried to take a step in that direction with the Phætons. But the foundation for doing that needs to be laid first.
What I wouldn't do is pick an existing pen and contract to slap a name on it. I mean, I could put a Fender logo on my guitar, but that doesn't magically turn it into one.