I have an OX multi-entry visa issued in Australia with 3.5 years to run. I’m leaving next week for a 10 day visit to Australia and understand I will need to show proof of health insurance meeting the new 1 Oct 22 requirements when I return. If I intend to leave Thailand again as soon as December, this time for 5 months, can I just buy the insurance for a short period just to cover me until I leave again in December (understanding I will need to buy it again in May next year when I return)?