You could also add your stuff under "rootcopy" directory, they'll be copied to the live filesystem.
I add firmware to my liveslak under /rootcopy/lib/firmware/intel/...
Quote:
rootcopy/ - this directory is empty by default. Anything you (the user of the ISO) add to this directory will be copied verbatim into the filesystem by the init script when the Live OS boots. You can use this feature for instance if you do not want to create a separate squashfs module file for your application configuration files
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