In XP, go to Control Panel -> Regional and Language Options -> Languages -> check on Install files for East Asian languages... the system will reboot.
After that, go back to the same Ctrl Panel -> click Details... button -> click Add... -> Input Langauge: select Chinese (Taiwan) -> check on Keyboard layout/IME -> select Chinese (Traditional) - ChangJie.
Just looked at the information on the 6th generation Changjie; it looks like that my suggestion for 麗 has already been included. 難(X) has been eliminated and "H" has been changed. I don't know whether this system will get incorporated in any future OS'es though.