Several years ago, I went through a similar search for Jeanrenaud switches as used in various Neve and Amek desks. C&K components, best known for their mini toggle switches and as the current manufacturer of the "Schadow" pushbutton switches, had also purchased Jeanrenaud. Several calls to the USA headquarters of C&K pretty much came up empty. The older style rotaries apparently are no longer made. I gathered it was because the european ROHS regulations made it not profitable for them to re-engineer the products to meet the new stringent laws.
(DO NOT get me started on the ROHS topic, one of the most stupid bureaucratic nightmares of the past decade.)
Colin at Audio Maintenance shows one Jeanrenaud switch in his catalog pages, and he may have other versions if you email him: Audio Maintenance Limited Switches
Looks like you will be seeking NOS for those rotaries.