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Add /usr/local/sbin/derived-mac and hook it from eth0 pre-up. The script derives a deterministic locally administered MAC from /oem/printer_data/.lava.sn or, if that is missing, from the cpuinfo Serial value plus the interface name. It only changes the address when the current MAC is a random locally administered unicast address, and leaves non-random MACs unchanged.
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Persist the locally administered MAC address assigned to eth0 under /oem/network and restore it before DHCP runs on later boots.
The eth0 ifupdown stanza now restores the saved address in pre-up and saves the current random address in post-up so the device keeps a stable network identity.