A 28-year-old woman with known type 1 diabetes presents with 24 hours of vomiting, polyuria and abdominal pain after an upper respiratory tract infection. Capillary blood glucose is 24 mmol/L and venous blood gas shows pH 7.18, bicarbonate 12 mmol/L and ketones 5.0 mmol/L. She is tachycardic and mildly hypotensive. After initial fluid resuscitation and potassium assessment, what is the standard insulin regimen recommended for adult diabetic ketoacidosis in Australian protocols?