Based on my experience for getting Thailand Pass, your plan should include the 7 working days (not counting Saturdays & Sundays) to get the Thailand Pass Test & Go model. Fortunately Feb 1 is a Tuesday. It’s a slow process. Feb 17 would be the earliest for you to get on a week long liveaboard, if all of the 3 swab tests turned out negatives.
Here is what I think is going to happen to you, assuming you get negative (-) results for all 3 swab tests:
Feb 1; apply for Thailand Pass Test & Go model
Feb 8; get pre-flight - swab test at home
Feb 10; receive Thailand Pass QR code
Feb 11; fly to BKK, Day 1 swab test & stay 1 night in SHA+ hotel in Bangkok
Feb 12; receive Day 1 - swab test, fly to HKT
Feb 15; get Day 5 swab test & stay in SHA+ in Phuket
Feb 16; receive Day 5 - swab test.
Feb 17; you are free to go anywhere in Thailand.
Any + result from Feb 8, Feb 11 and Feb 15 swab tests will mess up your plan. That’s why you are required to get the travel insurance with a minimum $50,000 Covid-19 rider and follow the Covid-19 protocol from Feb 1 to Feb 15 to make sure you won’t contact Covid-19 & pass all those 3 tests.
I’ve been tested 18 times for my 10 overseas diving trips in the last 12 months, knock on wood that I have never contracted Covid-19. However, statistically that odds are against me with how contagious Omicron is. Eventually I will get it. Just don’t know when. So stay vigilant in following the Covid-19 protocol (self distancing, wearing mask in public places or when self distancing is not possible, etc.).
Good luck!