I'm not great at maths, but I get a different figure for Option 2.
For ATO payments assuming we are talking about the Amp Sig Visa, the effective earn is 0.825 KF miles per $ (with the 10% bonus)
So 1007 dragon points is 830 KF miles. (For $7.80 CC surcharge)
That means a cost of 0.94c per KF...