Percussion Drumset Legend

Hello, I am trying to create a drum legend within my score. I saw an old post about this here: https://musescore.org/en/node/267792

However, the file included there seemed outdated, and showed symbols that I would not associate with a typical drum notation legend. The type of legend I'm looking to add in my score is similar to the image in the file below, and ideally it would be placed at the top left of the page above the rest of the staff lines. The closest I got to this was using Frames and Measures manipulations, but that messed up my measure numbers because it added the measure that I was using as the Legend as part of the score itself.

May someone please help me out with this? Thanks.