Peter I'm not familiar with that Hitachi router so I don't know if it's fixed base or plunge. If it's a plunge you might look at a Router Raizer system. I don't have one but other members do and say it works well. The M12V2 has a nut on the threaded rod under the plastic base that can be turned with a socket.
If you want a lift then you might want to consider the fact that a good lift may cost you more than a new router that has adjustment built in.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.