Yeah, "Append to Text File" only lets you save a single field (I think we have a feature request to append to text more fields or something like a template). I think if you use "send popup message" it gets recorded in the event viewer, but similarly it's restricted to one field or static text.
The only option other than email I can think of is an SNMP trap. Maybe configure a simple SNMP trap service on the same server and set it to log the event to a file, then use LEM to send the event as a trap?
Totally sounds like overkill, but lighter weight than email, I suppose...