Probabilty of these two events happening at the same time is nearly zero.
Interesting viewpoint ! Statistically the possibility of an engine failure is one 30 years and dual engine flameouts none whatsoever. So if you have less than thirty years to retire you can safely delete from FCOM the EFATO, dual engine flameout, the entire OEI performance. Same with Dual hydraulic, EMER ELEC and most other problems. Wow! The FCOM can be carried in back pocket.