Steve has just brought my attention to A Companion to the Works of Thomas Bernhard edited by Matthias Konzett (the author of The Rhetoric of National Dissent in Thomas Bernhard, Peter Handke, and Elfriede Jelinek), published by Camden House, another fine German-centric publisher ("scholarly books dealing with German and Austrian literature") who I noted last Thursday with reference to Scott Peeples' The Afterlife of Poe. A pdf of the introduction to Konzett's Companion should be available on the publisher website but, frustratingly, the link isn't working. I'll chase them.
Update: Boydell have just got back to tell me that the introduction to A Companion to the Works of Thomas Bernhard (PDF file; 97KB) is now back online. Thanks!