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Those are all great alternatives to John, especially Jonathan and Ian, but I don't necessarily find John too plain. I also like Jonas. Another alt. is Johann. If you think John is too boring, you could use it as a mn or a nn for Jonathan. You could also use John w/ nn Jack. I really like names that honor family, so I think its great that you are considering it.
Some ideas:
Brian Jonathan
James Ian
Jonas Grant
Ryan Johann
Jonathan Grant

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As for Emmaline, it's lovely, although I prefer Emma-line to Emma-leen. I would rather have a long name that can be nicknamed than a nickname to start out with.