The same question came up very recently. I had issues starting the wallet with the no sync flag but setting the server flag worked just dandy. You can then execute the command to export the back up, put that into an appropriately named file (wallet.zwl I think it says) and then perform the batch restore in Ywallet.
You could also sync this wallet fully and then just send your funds out to a new address. If you have problems with the batch restore method or sub account generation, then you can consider it an option.
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