http://felgendoktor.de/felgeninstandsetzung.htm
or...
http://www.wheeldoctor.de
I remember seeing a report on VOX's "mobile" show (on Sundays, ie the TV version of AutoMotor und Sport mag) and they shows this guy who drove a "wheel doctor" small truck right to your home and repaired the wheels. I seem to recall prices started around 80 euros per wheel(including paint)