There aren't many tables out there where the arm is on an arm "base" or "armpod" which is COMPLETELY separated from the plinth.
If you are willing to accept a "half-way there" solution to what you are looking for, like the Teres where the armboard is attached to an extension of the plinth, then you might also consider Galibier, MicroSeiki ( the larger ones - 1500, 3000, 5000, and 8000 series), or any number of other tables with similar set-up (Platine Verdier, EuroLabs, Simon Yorke, top-end Sota, Acoustic Signature). This is not to say that any of the above tables are only "halfway there" solutions to a high-end analog system, just that they only meet half the criteria you set. Come to think of it, of the ones I mentioned, the closest to separate arm base might be the Verdier.
If you are willing to experiment or DIY a bit, you could probably build a separate armbase where the extension could be brought close enough to the table, in which case a tall-and-thin plinth might suit (Teres, Verdier, MicroSeiki, Galibier, etc). If you went a bit further, you might be able to DIY your way into what you want through a project using Teres or Origin Live parts.
I, for one, look forward to reading others' suggestions to your search.