Interesting, if not highly unlikely, question. You are talking about failure of all generators and all engines.
On the 737 each engine has an engine driven fuel pump, but if the engine has failed it may not be turning enough to deliver fuel for restart. If your windmill relight envelope started at say FL240 (depends upon type) then you would certainly have enough altitude from cruise levels to dive and reach Vno by this level. This may be enough to wind-up the N2 sufficiently to operate the EDP to give you fuel for a relight.
The wing tanks have a small positive head of pressure from the surge tank vents but I doubt it is enough to feed a stopped engine.
A good one for the end of a sim trip.