I think you are going to need to make your own symbol key. The word processor you use is fine for the task.

I would recommend BabelMap, which is like Window's Character Map on steriods. Use it to view the fonts you use. You can place all the characters from a font into the location in it, copy tuem, paste them into the word processor. Save that file and in the future copy and paste from it into your working file. You can also use Window's charmap utility for this.

Mike