The idea should work ok, the only problem may be matching the speed to the power available.
Cut in should be plenty low enough, your engine will not want to be run above about 450rpm and if you have more output at that speed than your alternator can maintain then increase the air gap.
Don't forget that wind rating is very intermittent, with an engine drive you will have to limit the output to keep the stator temperature safe. You may find this is 500W or less if you run for long periods.
Certainly the alternator is in the right region speed wise and if you have the star point brought out you may do much better changing the connection to delta or IRP.
Flux