Have you considered installing a VM and writing your journal there? It can be totally made air-gap (although I suppose "virtually") and you can encrypt your VM

Have you considered installing a VM and writing your journal there? It can be totally made air-gap (although I suppose "virtually") and you can encrypt your VM session file in TrueCrypt. It seems to be keyloggers could still compromise your privacy, but if they can keylog you, then everything you have digitally is compromised anyway.