No, because they're done very rarely (he's a busy man) and he doesn't really "offer" his modding services. You can get it professionally modded by parts conneXion, though.
Blue Note Recordings, Patti Smith/Philip Glass, Chick Korea/John McLaughlin/Vinnie Colaiuta/etc, Seun Kuti & Egypt 80, Sonny Rollins. That's my tentative schedule for Jan-Apr next year.
(George, Ken, want to see any of them? )
Simple explanation: you like X about the Westone 3, and the custom tips make it more X. They don't like X and naturally don't like the custom tips that make it more X.
If you need those I/O options and will for a while, a good sound interface like a Juli@ or M-Audio thing might be a good investment. Then you could pull digital out from there.
Try and find music blogs run by people with similar/good taste. They'll unearth some rare goodies for you, as well as mention other goodies because they love talking music.
The only thing that's not well known kraut (at least from what I've seen) I can recommend is Gila. I have a "copy" of Krautrocksampler, if you want to "borrow" it.
EDIT: Tortoise and Stereolab are both good recent groups that are heavily kraut influenced.