Displaying a fake key

[Jacques Menu]

Hello folks,

I’d like to display the following as though it were in C major using \naturalizeMusic from the LSR (https://lsr.di.unimi.it/LSR/Item?id=266), but still display the original key.

Original:

Naturalized, with \key commented out in the Lily code:

Is there a way to display the E major key as a markup as a reminder, i.e. without it being taken into accout for the notes display?

Thanks for your help!

JM