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People are upgrading their 6hp's to 8hp's now on their e-chassis BMW's. For information, Look into CANTCU, there are some threads about this over on spxxlstreet forum (replace the x's with o's - this forum censors out competing forums). So you may be able to stick with your current transmission vs. downgrading to 6hp (not sure if n20 8hp's got a different version of that zf transmission than f-chassis n55 cars with 8hp).
Your idea would be a cool swap, but no small task, and expensive, so research, research, and research some more to make sure you really want to go down this path before buying any parts. Once you're confident you know everything that will be involved, you can decide if you think it's worth it.
You probably already know, but there are WAY more tuning options for n55 than the n20, and way more power capability. Most performance items for e90 n55's work on this car.
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