The Austrian Series is simply called Sportscar Challenge.
Not a lot of BoP there, but that one really is more or less a clubsport series.
Allows LMP-cars, though. LMP625 Pilbeam-Nissan is a pretty regular starter and there also was a Lola-MG a couple of years ago and sometimes Mirco Schultis brings out his LMP-C.
Best chance for news on that is probably running
www.auto-rennsport.de through google-translate.