There are multiple options, it is best to do some research and see what visa best suits your needs and which financial requirements you can qualify for, as they all have different requirements.
You asked the same question back on September 12th, you received the correct answers back then, review the comments you received then, nothing has changed since then.
You are not required to have health insurance for that particular visa, but of course insurance is always highly recommended, but it is not compulsory. Whoever told you that is wrong.
the Australian aged pension you are receiving cannot be transferred or willed to another person upon your death, each recipient of the aged pension must apply for it in person and pass the qualification rules to receive it. The widow pension is an old benefit and does not exsist anymore. So basically as your wife is neither an Australian citizen or permanent resident she will unfortunately receive no benefits upon your death, only what assets you leave to her in your will.