Might I suggest using a handwritten font? There is a nice set here:
that are royalty free and available for the mac and PC.
In particular, Dear Joe might capture the look you want. You can jiggle the kerning and such manually to make it look more random, but still legible (or render it large then erode the text).
I have to believe that an artist (especially one who keeps a journal) would have fine penmanship all the time
Otherwise, waiting for the next installment (like of like finding pages in a Myst game!)