The Geekria UltraShell Smart Case which I'm using now also allows me to store the headphones in the case with the adjuster extended fully.Really useful pictures thanks 👍🏻.
I haven't been contacted by Waterfield (I'm on the ships by 19 March batch 14). If I'm honest I would prefer the metal zip pulls if I were contacted, but I hasten to add there is nothing wrong with the nylon zippers (it's just personal preference).
I see from your pictures that you can have the adjuster on the headphones let out a bit and they still fit in the case. That's really good to know as the current headphones and third party case I have currently, only allows me to fit them in the case if I fully close the adjuster.