Ruinart actively and beautifully promotes Singulier Edition 20, which, by the way, can only be bought at the winery store.

Ruinart Blanc Singulier Edition 20 is a more complex version of Blanc de Blancs, made exclusively from Chardonnay.
It is based on grapes from ten crus located in different parts of Champagne: Montagne de Reims (Sillery, Cernay-lès-Reims), Côteaux d'Épernay (Épernay and Monthelon), Côte des Blancs (Bergères-lès-Vertus), the Petit Morin valley (Villevenard), the Sézanne region (Bethon, Montgenost), and the Aube department (Les Riceys and Montgueux).

Regarding winemaking practices for Edition 20:

The wine consists of 76% from the 2020 vintage and 24% from reserve wines.
The reserve wines come from a "perpetual reserve" started in 2017 with the first blend of Blanc Singulier and subsequently supplemented with wines from the 2018 and 2019 vintages.
Half of the wines are aged in oak barrels, half in stainless steel tanks.

Dosage — 0 g/L (Brut Nature),
alcohol content — 12.5%

Price - about 120 euros, if I remember the store prices correctly.