Faster trim in Media Encoder

Hey, don't know if I've missed anything easy, but, I sometimes have livestream recordings that I didn't stop and I realize that 20 minutes, an hour after the end of the session.

So what I need is pretty basic : keep the good part, trim the end (and yes, I can take the time to find where to make this one cut)
When I do this in Media Encoder, it proposes to reencode the whole video (minus my cut), which takes a loooooong time, although it is set to "match" everything.

I perfectly understand the need to re-encode, but I wonder if we could have a quick and dirty "cut here" version of the file, even if it requires to analize and reencode the last 10s of the cut movie and add a correct EOF.

I suppose this should only take writing file to disc (I'm 20 minutes inside a trim video action right now, got too much time to think).

Thanks