First you fly the airplane. That means you fly a speed within amber limits.
Get a working flight director in level change. Do not look at your FMC: there is nothing useful in there, besides maybe alternate airfield distances.
You have no APU bleed, so you wait for adequate airspeed. Then keep trying a windmill start while getting a QRH out. Does not cost anything.
At a start level of 410, at least time is on your side.
If the engines are not damaged, and you have fuel onboard, chanches are big at least one will start and run later on, once you fly through denser air
One of the proposed answers was to exceed VMO. Please restate your objective.