I'm reading all the posts with great interest but find myself a bit challenged for time because I'm changing day jobs. Having worked ten years at the previous firm there's a lot of debriefing!
I've used the TV screen link on KN7000. Mine isn't very clear on today's TVs, I had better results on old CRT TVs but that's probably because the TVs themselves were not so good so virtually anything seemed acceptable! I know of several people who do use this feature to project lyrics onto large TVs for use in church, for the congregation to sing along. Of course you would have to be running a Sequence for that... so no extra verses on the fly!
I'll join in the other posts as soon as I get a few spare mins!