Willie-OI have searched many times for Flambeau guitars on the net with virtually no results. However I have spoken with a long-standing and knowledgeable guitar shop in the UK and have been told that they were made for a relatively short time in a small Japanese factory from designs by George Lowden as you mention above. So to all intents and purposes "Japanese Lowdens" as you say.
As mentioned above I am happy to email you photos of mine if you are interested.
mooman