Hi again, I just experimented this on the JarDesign A320 V3.0r1 for X-plane 11, with X-plane 11.0r1.
I haven't found any solution to have the engines turning after loading a saved situation. In this case, The flight had been saved while cruising at FL220 between LFRS and LFPG.
I only managed to restart the engines after gliding back to FL80, at 330 kts, which seems to be a bit low but I have no precise idea of the real procedure and parameters.
It is true that even at this point, the workload is tremendous if you want to come back to the situation you actualy saved. I would recommend to reset failures at this point : this might help taking the RAM air turbine back into the fuselage and making the situation as clean as possible.
If you are willing to push JarDesign and other developpers into improving all that in close coordination with Laminar Research, I think many many people will be very happy with the result. This might be such a complicated task for everybody, with all the plugins and datarefs... I don't even want to think about it!! :D