Thought about this some more. Write a TN that says all the blue words are underlined. Then just use the blue indicator for all those blue words that are also underlined. When you get to a word that is blue but NOT underlined, use the blue indicator, but precede that word with a TN that says that although the following word is blue, it is NOT underlined. At least that way, you are showing only one indicator. When you get to that black word that is also underlined, just show it as underlined. In that way, the braille reader will read exactly what the print reader sees.
Perhaps that will take care of the situation. Let us know!