First of all, did you know that the first recorded written instance of this word, which was in the Oxford English Dictionary (obviously from the UK), spelled it alumium? So if you keep being stubborn about absolute originality, you should probably say it like that!
"The man who discovered it"---that would be Humphrey Davy. In his 1812 book, Elements of Chemical Philosophy, he originally spelled it--guess what--aluminum.
It was actually an ANONYMOUS contributor, in another paper, who changed the word to aluminium, citing a "less classical sound".
I know you provided plenty of examples, but they weren't good ones! What about platinum, molybdenum, and tantalum? Also, don't forget that alumina is the oxide of aluminum, like lanthana is the oxide of lanthanum, while magnesia, ceria, and thoria are the oxides of magnesium, cerium, and thorium respectively, so there is plenty of precedent for aluminum. Looking at the word roots, 'aluminium' just doesn't make sense. 'Aluminum' is correct.
As we say here in America, only half-joking, "The English: they invented this language and can't even speak it."