A good source for records in Austria, especially Vienna, is the free
There are categories for Jewish resignations 1868-1945, Jewish converts, Jewish divorces 1870-1942, Waring cemetery, other Jewish cemeteries, an index of Jewish records and many, many non-Jewish general listings on the site.
There is a listing for an index, Proselyten:
"The Index Proselyten, created by Univ.Doz. Dr. Anna Staudacher, refers to the double volume recently published by Publishing House Peter Lang:
Proselyten und Rückkehr (Proselyten und Rückkehr - der Übertritt zum Judentum in Wien 1868-1914, Peter Lang Edition, ISBN 978-3-631-60683-4) - an inventory, the date of birth was added for the more detailed identification of the persons.
Part 1 - 569 pages - contains introductions to the sources and the topic in German and English as well as a marriage list of those who converted with the date of conversion (pages 217 - 563).
Part 2 - 827 pages - contains the data of the proselyte protocols in editorial form with a multitude of supplemental sources to the spouses, parents with their occupations and children, to rescissions, now and then also to changes of names - with a bilingual
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Researching SCHANZER, BORGER, BIRN, JACHZEL in Andrychow, Wadowice and Bielsko Biala in Galicia,