Read ETW TraceEvent and then write it back - windows

Question

I am writing an application that is processing windows ETW events.
My application creates a logman session and configures the events to be written to .etl log files.
My application reads these .etl files, processes them, and then deletes the file.
Problem: It is possible for this processing step to fail (see the code below).
I need a mechanism to write-back the ETW events to an .etl file, to be processed later.
How can I write a Microsoft.Diagnostics.Tracing.TraceEvent object (obtained via DynamicTraceEventParser callback delegate) back to disk (ideally, back to an .etl file?)
The solutions that come to mind:
Write the failed events back to an .etl file -- this is the desired solution
Simply retain the entire event file in the event of any individual event processing errors, and let the successful records get processed twice. -- unfortunately our processing operation is not idempotent, so this will not work. (We can't allow records to be processed twice)
Write the event back to ETW event store-- I am open to this but would prefer option 1
The (simplified) code:
// For each .etl file
foreach (string fullFileName in eventFileNames)
{
// Load the .etl file
using (var source = new ETWTraceEventSource(fileFullName))
{
var parser = new DynamicTraceEventParser(source);
parser.All += delegate (TraceEvent traceEvent)
{
bool proccessingSucceeded = ProcessEvent(traceEvent); // Processing code that can fail
if (!proccessingSucceeded)
{
// TODO: figure out a way to write this event back to disk (.etl file) to be processed later
}
};
source.Process();
}
}