I managed to get the firmware to load up, maybe incorrectly, since now libreelec says there is no bluetooth adapter found. lol
I made a folder /storage/.config/firmware/brcm and added the file in there.
It is now loaded but maybe too late in the process for libreelec to use?
Maybe I will pick up the Sony usb dongle, but if anyone wants to humor a computer nerd (not a total linux expert though) I wouldn't mind working this to a solution.