Take a hotel room or a serviced apartment for a few weeks. They will report your stay to immigration. Airbnb owners may be unlikely/unwilling to report who is staying at their property.
Yes. I did it about 2 months late once because we didn’t have the blue book to register our apartment online. I did it when that was straightened out, & no questions when I did my next 90 day report as staying at that address. The date signed in didn’t seem to be a problem
I believe you transfer the money to your Thai bank account CLEARLY marked for purchase of condo. But you pay the seller from your Thai account. At least that’s how it was when we bought.
To put it plainly, EACH person must be registered separately at the address where they are staying. You enter their name, passport # & country of origin. We own our condo. When we arrive in Thailand, or back from a trip within Thailand, I must log in and register myself as staying at that apartment, and ALSO register my husband as staying at that apartment. I am listed as the owner - the owner must register EVERY person staying at that apartment, individually.
I also use this clinic for vaccines. I asked a friend in Taiwan the price for the shingles vaccine there (I travel to Taiwan frequently) - it was cheaper at this clinic in Bangkok. Their prices are on the website, so you know in advance. (My friend said he'd get the vaccination next time he's in BKK 😅.)