Double lyrics in part of composition

[Jogchum Reitsma]

Hi,

With the help of Frescobaldi, I try to set du Prez' El Grillo.

It has a two-verse piece in the middle, which I can't get right.

Iǘe added the jpeg of the piece to be set in lilypond, and the .ly-file 
create so far.

Anyoane an idea how this might be coded in lilypond? Preferable without 
disrupting the structure created b frescobaldi too much, but I'm not 
sure that is possible.

Thanks for any help in advance!

regards, Jogchum Reitsma