Not sure if this can help, but I built a little tool that will receive MIDI commands and pop up an Alert message for some time - fittingly called “MidiAlert”. So I have a binding in my background rack that sends a sysex message to this tool (via a virtual MIDI port) to pop up a little window informing me of the current loaded song and song state.
I have also wrapped this into LivePrompter, so if you are looking at alternatives to SongBook, LivePrompter will work with your ChordPro files and now has MidiAlert built in. Haven’t gotten around to documenting that change yet, though 
Note: the thread linked above has outdated download links - can’t edit it anymore. So here’s the link to the current installer for MidiAlert 2.
Cheers,
Torsten