Chida Sensei's group has senshusei classes ...
http://renshinkai.com/e/
Senshusei (intensive) Short Course for Black Belts
Posted on 6月 18th, 2012
Shidosha Yosei Short Course (Senshusei) 2012
Duration: October 2012 – February 2013
Minimum Hours: Tuesday to Friday 8:00am to 1:15pm, Saturdays 6:30am to 1:15pm
Requirements: a recognized black belt in Renshinkai or Yoshinkan style aikido