>>> daemon_flags="-c /var/unbound/etc/unbound.conf"
>>
>> This is the default and can/should go, making our script even shorter.
>
> yes I think that does make sense.
Before you remove it could you review the chroot section in man unbound.conf.
chroot: <directory>
If chroot is enabled, you should pass the configfile (from the
commandline) as a full path from the original root. After the
chroot has been performed the now defunct portion of the config
file path is removed to be able to reread the config after a
reload.