Put it in a folder, add a couple of real porn images with unsettling file names then compress it into an encrypted rar/7zip file with a much stronger passphrase.
When someone got his hands on the file and tried to view the contents, he will just see file names of "personal" images and might just leave it since it's encrypted.
That's one example, you can use a different set of "regular" file types of your choice like .mp3 (for 2-5mb wallet files) or .mp4 (for huge wallet files).
[Encrypted rar files can't be previewed, file names are just listed]
One alternative to CryptoSteel™ is to Tatoo your BIP38 Password-encrypted Private key to your Pelvic Area, safe from house fire or tear down.
That way, only your spouse (or a prostitute) can see your encrypted key
