60 visa waiver will give you easily enough time to complete that course and 30 day extension if you want to stay longer diving,and as long as your just taking the course and not working ,your fine on the free tourist visas
So many people are looking to move to Thailand to live now ,so this is why Thailand ,unless your investing and providing jobs,Thailand isn't interested in jobs for farang ,as they want jobs for Thais and look after their own population ππΌ
Don't believe anything you see on media or especially social media reels ,most of its AI fake and bad taste ,Go to Bangkok as the last thing it needs is a dip in tourism ππΌ