Having read your post again (slowly this time) I understand what your getting at.
It was the
so it's entirely possible that only two tags are available at the headunit
that stuck in my mind when I replied sorry

.
And you are correct in that the Kenwood can only display a maximum of two lines of CD Text when used with Phatnoise PMM but you can set it to display any or all of the 7 different Tags on each of these two lines of text.
The third line (in my case) displays play list number & track number no matter what the other two lines are set for so you can get three lines of different text but you are unable to change what the third line displays.
Again sorry for any confusion