Sadly, I'm not currently smart enough to do so.

I've decided to go a different route, (which I'm ALSO having problems with) and will have a string appender tied to a label (which does use a textvariable), but currently I can't seem to get l4p to populate the string appender as I expect it to.

To view the log, I'm just going to place a button on the UI to open the file in a text editor that can be set from a conf file.