Daru is def not a place to stay. I recommended flying into horn, refuel and spend the night, then the next day do Daru, coming home via some of the outer islands (such as Murray and Coconut).
It is a bit of paperwork, so make sure you don't take it lightly. As for the HF, if you stay on CTAF there will be plenty of aircraft around to hear you if you get into trouble. Just make sure you read up on the Horn Island ERSA procedure, as many pilots don't and make some serious mistakes (frequency, runway usage, etc).
Feel free to PM for general regional advice
