Yes, we are both members of Aktion 23 (actually I’m the primary admin of the forums and IRC channel over there) which is the oldest still existing and largest known (at least to me) German-speaking Discordian DisOrganization (Whoever reads this and disagrees: Prove me wrong).
Aktion 23 is quite a loose thing without clear definition, personally I see it as some kind of meta-cabal (most members of Aktion 23 are still members of some other original cabal) or even a Discordian Sect, but (as usual) the other members (especially Apfelsator) would disagree. Right now, online activity is comparably low, we have lost some of our strongest contributors, yet the member count has always been quite fluctuating. Truly active members never seemed to exceed a hand full of people, at least not during my active time, but it’s hard to tell about the activity since virtually anyone can adopt the “Aktion 23” name (similar to Operation Mindfuck or Anonymous). We are quite long-running - Bratislav Metulevskie (who probably is founder of Earth’s branch of Aktion 23) can trace back the roots of Aktion 23 as reaching back to at least March 1996 (I love parentheses. Just sayin’…).
Topics cover the “usual Discordian spectrum” of pranks (we are prone to fail at playing them), magic, politics, art (creation of more or less iconic imagery, more or less holy scripture etc.), random activism (often similar to your definition of Discordian Activityism) and other bullshit, without any clear direction. There are Bratislav’s two books (German language again) related to Aktion 23, there are broken and lost forums, some heaps of German Discordian Holy Scripture and a bunch of stuff hopefully yet to come if we ever find some time (a German language Discordian wiki for example).
I hope that was satisfying even though with most links you will run face first into the language barrier.
BTW, I guess Chasing Eris will probably shed some light on Discordianism in German-speaking countries too, and I hope it will be some fancy colourful light.