[mothballed]

Catastrophic health insurance for most those things is very inexpensive, relatively, but you have to re-buy it every 3 months and then "pre-existing" conditions reset. The expensive insurance is for covering ongoing expenses, as predictable expenses or at least those known 3+ months in advance are the vast vast majority of health care costs.

Realistically catastrophic revolving temporary insurance plus managing what you can in Mexico, plus occasionally paying out of pocket would mitigate the vast majority of yours risks while keeping expense relatively low.