A caveat on doing it in the sim: if the sim was not intended by design to support this kind of flight condition, then there may be no guarantee that it will reproduce the actual aircraft characteristics, whether flight behaviour or systems.
To the best of my knowledge there are NO sim data standards that would ensure appropriate flight performance - so you could easily get a misleading behaviour. And there's no guarantee that the systems behaviour will be what you might actually see "for real".
Understood but I would be very surprised if the aircraft was significantly different in any important way from the sim. If the model is realistic enough for general handling and engine failures on a ZFT conversion, then where are the problems?
You’re well within the tested flight envelope, as opposed to deep stalls, transsonic dives, spins, etc. It’s the same airframe just lacking in thrust. Makes the sums easier: just lift, drag and gravity now!