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@stefano @yvan ok. Thank you. Didn't know that about FreeBSD. Was just conveying how it can be done on obsd. That's all.

@yvan @stefano read-only root on OpenBSD is easy:
. mount_mfs /dev with size 20m and -P option pointing to a copy of /dev; needed for writable device files; copy of /dev in any dir can be created with 'sh /dev/MAKEDEV all'
. Writable /etc/random.seed is needed at shutdown/reboot. So, make it a symlink to /var/db/random.seed or /var/run/random.seed.
. Test above and set mount / mount option in fstab to ro.