You can register a legal alias (通称名) that you can use on forms. I know people who have done this with just single a single kanji to avoid a lot of the headache associated with having a foreign name or (god forbid) a middle name. I've considered a few times registering my legal alias as 一一 to have a two stroke full name.
I'm not sure I understand this characterization of Oppenheimer. There are a few people who could take this title but I don't think Oppenheimer has anywhere near the same claims to it as someone like Leo Szilard or even Enrico Fermi.
If by inventor they mean man who "put into practice", I don't see why the director of a project employing hundreds deserves the title of "inventor".
> "hidden in plain site", the archaeologists say, as it is just 15 minutes hike from a major road