Red Button Solution
Barit1 makes a good point...indeed the industy knows about fuelconsumption...but
one wonders if the smaller inlet of the JT8d type of engine and its non computer controlled ways might have survived this unique encounter.
So, in order to get the fuel efficiency, build the engine, put the FADEC on it and a red button, as previously suggested, BUT that red button would REPROGRAM the FADEC to a 8 minute limit...allowing 25% more fuel to be introduced and all other parameters INCLUDING vibration to be overlooked. You could even transmit a signal saying...ENGINE NO GOOD NO MORE.
I think it will always be easier to swap engines, then to refloat a plane.