All your alternatives are possible. I'd probably tend to just say "on paper". ".
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PeaceblinkfriendMight I ask what 'it' means in 'I find it easier...'? What is being referred to by it?"it" has much the same function as in "it's easier to do it this way", "it's not my place to comment", "it's raining", etc. It doesn't refer to anything very specific, just vaguely to "the situation". Personally, in everyday use I don't consciously notice it