Here you can see the backside of the Wenger emergency blade. There are different names for such an edge.
It is no point of getting alarmed and afraid of a serrated edge. It takes very little practice to learn to sharpen them. The backside of the blade
shown on the picture are not the main sharpening side but only used to remove the burr from afterwards. There are plenty of videos on youtube about how to sharpen wavy or serrated edges. It is absolutely no problem today to get a diamond rod for this task.
I recommend getting a diamond rod with a fine surface. It is not needed with much pressure.
I have made some information and pages on how to sharpen on sakhome.com
and I recommend the sharpening page.
It is very important that a Rescue blade is sharp all the time and
a dull edge could be dangerous.