One other option, if you want to add more hardware, is available in the upcoming app version later this month ... you will be able to display one attached document (or the built-in lyrics field) on your device display and a different document (or lyrics) on either an external display or a second device via the device linking function. The external display functionality only works on iOS and the second device functionality only works with an iOS master device, but the slaves can be iOS or Android.
Depending on how much text your "song form" requires, it might be sufficient just to design a layout that lets you put that into the Notes field and display it alongside your lyrics, and then you would have a much simpler on-stage setup.