Threesukhumvit were very responsive and have a great refund policy. They refunded me my entire reservation when I had to cancel the day of my flight due to COVID
Sandbox and test n go I was able to book together in both of them. Usually they even have special discounts for the second person. I’m 90% sure it goes for AQ as well but really it’s up to the hotel
You can go straight to krabi for your first night. It’s within the transportation kilometer Limit for sandbox and test and go. No need to stay in Phuket. You will have to pay for private transportation through your hotel and include that in your Thai pass hotel confirmation page.
Transportation cost me 3,500 baht to do my first night in railey beach 😁