Is the Phuket Sandbox the best option to avoid quarantine when traveling to Thailand?

Hello! I know that planning ahead for travel to Thailand these days is a nearly useless endeavor, yet I seek some travel advice for this fall. My parents (both fully vaccinated US citizens) intend to travel to Thailand from the US in late October. I will fly in from Seoul, South Korea in late December with my wife, both fully vaccinated by then. My brother and his wife live in Chiang Mai, and ideally we would all like to fly in there and avoid quarantine. However, the proposed Sept 1st Chiang Mai opening isn't looking great. Perhaps the mid-October 🇹🇭 opening isn't looking great either 😬, or is it? If we want to avoid a 2 week hotel quarantine in Bangkok or Chiang Mai, are we all better off entering via the Phuket Sandbox, and moving on after our two weeks there? What might you do in this situation? Thanks so much! I understand that no one has the answers and we need to wait and see, just curious as to the thoughts some might have, or if others are contemplating similar choices. Khap 🙏!