What you are calling the "Main Key Chorus" is in the key of E Major.

Your "Raised Key Chorus" goes up one step, to the key of F# Major --BUT it is really Eb minor, which is the same key signature, the scale just starts on different notes.

The five chord of F# Major is Db. Okay to call it C# if you like, same note.

Or use the Five minor of the Eb minor key, which is Bbm.

In other words, where you have the F#7, play either a C# or a Bbm instead and go on to the next part.

The last chorus ends on the Eb (which you are calling D#, same thing) so that chorus is in Eb minor.


--Mac