If going option 2 I would triple check there is absolute certainty that you are eligible after the 12 months, I knew someone who signed up to get an OP after 12 months only then to find out (I'm not sure of the reason) that he had to wait another 12 months.
I'd also maybe give a couple of the surgeons a call to confirm what price it would be privately (including anaesthetists etc) sometimes they will do it a bit cheaper with a little bit of sob story, ie pain is almost unbearable, can probably only just afford it, will wipe out most of what you have but don't know if you can wait for the public system etc. You can then weigh this up against keeping on paying your private health insurance, out of pocket costs etc which will probably be at least half of the $25,000 by the time all is said and done.
How much of a financial hit the difference is, only you can really weigh up, but if it's likely to just be a bit less you leave when your time is up, just spend the extra and enjoy the times it buys you.