I should have been clearer in my post, that it applies to 737NG... But obviously the classic doesn't have EECs, so it should be clear anyway.
The 737 Classic doesn't retard to idle, and hence is probably equal in severity as the 767. My previous company operated both Classic and NG, and our emergency briefing also contained that only action below 400' would be to shut down the affected engine, in case of reverser unlock. Tried it in the sim once, maybe in 1 or 200 feet, and it was a non issue when prepared for it. I can imagine it would be different if it comes as a surprise.
That's the reason, I had this information in the back of my head, as I enquired about it, at my present airline. They don't see it necessary to be part of the briefing and the explanation I got, was that it is a non issue on the NG.