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David,
Over the years I have encountered quite a few different combinations of brake line fittings and usually when a straight thread fitting was used, it had a flat copper gasket/washer that seated between the flat on the hex portion of the hose fitting and a flat on what ever fitting it was screwed into when tightened. I have only used the copper seat flares on male flare fittings, not on the inverted flare fittings (that doesn't mean that it won't work, I've just never had a need to do it). The copper seat flare that is shown sitting in the inverted flare of your hose fitting (your last photo) looks a little large for the application, but I suppose it may work as long as there isn't any interference with the internal threads.
Sometimes brake line fittings can be a pain in the butt. Hope it all works out well.
Ted
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