Default Tasker unread sms bitmap

Is it possible to change the font on this bitmap set or is it fixed.
If not. How would I use tasker to show only unread sms messages.
I've created a variable in tasker to set to 1 when a new notification appears from my messaging app bit I'd like to show unread messages and not have them clear once I open the app.
Possible?

LG-G2 / Android 4.2.2