Ethernetp device similar to ont

We are looking to find a device that would work similar to a fttx ont but do it on copper(ethernet). It would need to do dhcp snooping and relay for v4 and v6 adding option 82 in v4 and 18, 37, or 38 for v6. Ideally something like mikrotik's gpen21 would be perfect, however that doesn't have the v6 tagging capability we are looking for. Has anyone seen something that would do this?

Thanks!