TPWS?
Given the nearly centimeter level accuracy of CAT ADS-B GPS sources, it would not take much math to predict engine out height over threshold given cumulative acceleration and runway position.
If less than 50' a stop alarm could be issued while there still remains adequate stopping distance. A fancier system would message the auto throttles to advance.
This could all be done with GPS and airspeed inputs completely independent of FMS.
Threshold Proximity Warning System