Yeah, it's all there in the signed message. That message can be decrypted to get the original file back. As for a more elegant way, I don't know. Maybe certain tags (I like "test" may work like this?) could be ignored by most interfaces including STEEM? With that, we'd have concerns about vote abuse though (imagine a whale voting up their own hidden crap every day). There's no fancy data insertion, just the text you see in the post.
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Regarding the whales, they can alreayd upvote any of their own crap (ie. Bernie Sanders does this). I think self-voting can be an issue, but this doesn't change that dynamic.
Also, I envision a service that generates a private/public key pair for you (similar to how crypto web wallets work) that will then encrypt your data and submit it to the Steem blockchain as a service.
Can someone grab and hide that shiny object for me? I'm going blind...