Chances of restart not very good, I suspect. Think how long it takes an ice cube to melt in a room-temperature drink! So from a couple of thousand feet or so there will not be much likelihood of a re-start. Number one priority is 'fly the aircraft', finding a good field and executing a well planned forced landing pattern. NB that if propellor is stationary, rate of descent will be greater than for PFLs with throttle at idle.