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e¢ü´ßd®µUεñ9D£_¾ñ+'W§LAs long as you have at least 1 split UTXO, if you send your max balance to yourself it will split them. No external wallets necessary.
https://whatsonchain.com/tx/914fc2f5946e93c27c7b9f32067fb2b662ad59a6fbd66deec6a26feaf245096c