I came across this nicely researched article on Champagne Aubry which I thought worth sharing. They too have planted all seven permitted Champagne varieties although it is shocking to see how little Arbane is in the world. Hopefully, I can help to rectify that. Think I ought to get in touch with them!
The Forgotten Grapes of Champagne
Domaine Anthony Woollams 
Really interesting – thanks for sharing!
My pleasure grapefulapp. Thanks for following.