No, because the tension in the fabric of the band is instrumental in producing the support, and a fully adjustable bra would have varying fabric tension which means varying force so it wouldn't work. This is why straps can be adjustable: The tension produced by the straps isn't instrumental to the physics of the bra.
This blog post [0] goes into a bit more detail on the physics of it all if you're interested:
It's possible to make bras that don't rely on tension - Empriente does it - but they're insanely expensive at over $200 per bra. (Compared to 15-20 dollars at Target/Walmart or 60-100 at a decent boutique).
There are still issues, though, because you need to consider that while a 30FF and a 38D are the same size in terms of tissue volume, the distribution of that tissue differs a lot. The wires need to be placed differently even if the same wire is used, so the wire itself would need to move which would be very difficult.
Not really, because the cup size based on volume. It’s not just a matter of adjusting the straps and chest band.
So, you can have two women with the same total bust measurement, but very different chest/rib measurements (and therefore very different breast volume).
And as breast get larger/heavier, the bra construction has to change to provide support.
You cound then read out how it's set up and use those measured values to tailor the final garment.