I was mistaken about the settings page properties file - those keys should just be in the main LRS.properties file.
It’s settings records that are automatically loaded and must have a mirrored package structure (things that extend PersistentRecord).
If your bundle is being loaded correctly you should be able to reference the keys/values by at the path “LRS.path.to.key”, so:
LRS.nav.header
LRS.settings.title
LRS.lrsTitle