Keep trying, until you've got one going. What have you got to lose?
Interesting that because there is no specific mention to close the thrust levers first, before you start the Loss of Thrust on Both Engines memory items, should one assume that you don't move the thrust levers from their current position at the time of double engine failure and during the memory items process?
Normally before effecting a relight on a failed engine, part of the procedure is to close the thrust lever first. But apparently not so in the dual engine failure case. I wonder why?