Brooks and Campagnolo used to have a narrow spaced rail, seatpost combination the saddle was a special model of their Professional .. Tulio made a saddle rail clamp set to fit that rail spacing.that allowed the rail adjustment range to be large.. now the Selle Anatomica may offer some greater range of adjustment , with what has become a fairly standard rail spacing.
So I'm wondering if a sprung/padded saddle exists that has rails that go close to the nose like some racing saddles do?
don't hold your Breath,, the 1st example was race , sold for a fortune, used, when at auction,
the 2nd is also a steel frame sling leather saddle without padding.
what you may need to do is get a custom /modified seat post to place the saddle you like in a relationship to the BB that is suitable.
you are asking specialty parts for a JRA low pricepoint market niche.
Of course You can Buy a Selle Anatomica Saddle, and put a gel saddle Pad on top of it.
It is not a mattress wide saddle anyhow..