This is how we work during a perfomance :
We (Wietse & I) both have our songbook with songs ordered the same way. In the books every song has an 'own' page-number, so we only have to communicate the next songs' pagenumber.
e.g. In my book 'New York' has pagenumber 65 and 'New York' got registration-address 'Block 15, preset 4'.
So I press 'Bankselect', 'P2', 'Reg.mem 4'.... ready !!
In my view the MF is not the correct feature to search on the fly.
Ideal solution :
On the music-stand a small booklet with your repertoir-list (database) including the Reg.mem. address.
Calling a reg.mem. adjusts the T2 and shows sheetmusic and/or lyrics-chords on a separate 15"TFT screen(s).
You can sell your other electronic-songbook Scott
..... you won't need it anymore !