# Pastebin rcqRD5l1
steev@wintermute:~/kernels/torvalds$ cat /etc/systemd/system/bluetooth.service.d/override.conf
[Service]
#ExecStartPre=-/sbin/rfkill block bluetooth
# MSB
#ExecStartPre=/bin/bash -c 'sleep 5 && yes | /usr/bin/btmgmt public-addr "ZZ:YY:XX:0D:A8:F4"'
# LSB
ExecStartPre=/bin/bash -c 'sleep 5 && yes | /usr/bin/btmgmt public-addr "F4:A8:0D:XX:YY:ZZ"'
#ExecStartPre=-/sbin/rfkill unblock bluetooth
# Blank ExecStart line to clear the service file, overrides are additive.
ExecStart=
ExecStart=/usr/libexec/bluetooth/bluetoothd --experimental