I think they'll probably pick up that you're repeatedly getting a new policy every 12 months, and if you ever made a claim, I'm pretty sure they'd enquire about what visa you're using while staying in Indonesia.I return to Australia each 12 months and buy the Travel Insurance there to last 12 months whilst I'm in Bali. It will cost about A$1,000 for budget cover which includes evacuation.
Because of your age, there's just no cheap and easy option. Sucks to be old, I guess.
You could revert to using a Sosial Budaya visa, and add a 6 month visa run to your yearly schedule. Just a thought.