Please allow me to go back at my previous suggestions that could help untie critical situations as this.
a) Engine Control: IF TL #1 is retarded to Reverse AND the TL #2 is above Idle and bellow Flex/MCT/TOGA just set Idle thrust on Engine #2 (clear last info on TL on A/THR disconnect) and return to TL indication if moved again.
b) Spoilers: their automation logic is very cool indeed but let them out IF the pilot moves the handle all the way down (mechanical override).
I know, its not been tested, approved, too much money to investigate, certify, install, etc... but wouldn’t you like that on your plane?
GD&L
P.S.- I’m with SR71 when he says that this is one of the best discussions ever seen on PPRUNE. My applause.