Another underlighted aspect of Farwerck: he was member of the Universal Sufism order of Hazrat Inayat Khan (1882-1972).
In the biography of Khan I had found a reference to “de heer Farwerck” not knowing if this was Franz or his brother, I mentioned this in passing in the biography. There is a Dutch website about the order, particularly in the Netherlands, which has some more information.
Farwerck is mentioned as an “early mureed” (initiate) of the order. He became a member in 1921 and in that and the following year he was secretary of the Dutch branch of the order. He was followed up by Eqbal Dawla van Goens van Beyma in 1922. In Sufism: A Quarterly Magazine 1921–1924 Farwerck is also mentioned when the early days of the Dutch department are described.
On the website Sufipedia.org has some information about Farwerck (mostly from Wikipedia) and there are some familiar names, such as Anne Kerdijk (wife of Stephan Schlesinger who designed the cover of Farwerck’s first book and his Masonic ex libris, Kerdijk was one of the first Dutch co-Masons). There is also the couple Van Meerwijk who were also fellow Masons (they left Le Droit Humain in 1940 together with Willy Farwerck). The couple Van Ginkel (early co-Masons, Van Ginkel initiated Farwerck in 1911) were also active here. We also find Nico Kluwer who would publish Farwerck’s final book after Farwerck had died.
The biography of Inayat Khan has more names. Baron van Tuyll van Serooskerken (chairman of the first National Executive Committee) who was married to “my mureed Miss Willebeek Le Mair”. Sakina Furnee and a mr. Wegelin. The mentioned periodical also has a few names. Interestingly, Joseph Newton Fort (1880 – 1950) appears to have written for that very magazine. Could him and Van Ginkel have got to know each other that way? Van Ginkel translated and published works of Fort through his Masonic publishing house.
I don’t know how long Farwerck was a member, but in a letter of March 1926 about something completely different of Kerdijk to Farwerck, Kerdijk mentions in passing troubles within the organisation. It sounds like they were already a bit at a distance, but still involved.
This ‘neo-Sufi order’ is certainly the most ‘spiritual’ interest of his that I have found so far.