Go for it! CDPATH is an underrated tool.

You can do a simpler version and just set

  CDPATH=/path/to/cjd

but then you'd have to tab through the e.g. "30-39" index directories first.

Or you could change the path in the find command to

  /path/to/cjd/*/*

and go to the final xx.yy directories directly, but it hardly saves you any keystrokes when you use tab completition.