You can do it with agent ..it's aprox 30k but you don't need money in bank at all .. but you need a 60 / 90 day visa first ..I always done it myself. But many I know use a agent costs more but it's easy
Why bother going at this time it could all be in vain if you are positive when land in Thailand. Then of to hospital for 10 days ....I lived there for over 10 years great place to live but untill all this nonsense is over I'll wait to get back ....
Why bother for six days ...you could get stuck there and even if double jabbed could be positive...no point in going for six days at all ..maybe 6 weeks ...