You're still not getting it. Bangkok Bank wants serious customers,they don't want accounts with 800k popping up and then after 2 months the balance is down to zero. I won't be surprised if other banks like for example KBank will do the same. You can always change bank if you're not satisfied. Bangkok Bank won't care the least.They don't want whining clueless customers. You must be a rookie in Thailand.
It's 4 months instead of 2 months. Thats the only difference, and only for the first year. The second year it's back to normal as long as you have kept those 800k in your account as required. As a retiree and on long term stay, you won't even notice a difference.
You're not very smart. You'll still get your bank letter when the money needed at immigration have been seasoned 2 months. Your money will just be frozen for 2 extra months. Get it?
Maybe you should find out the reason for this quite new requirement at Bangkok Bank before you're complaining. Bangkok Bank is fed up with 800k deposits from agents popping up in accounts, then disappearing after 2 months. Get it? Who cares about you changing to SCB? Stop whining.
Applying for a visa in Indonesia and thats why you need your bank statement translated? You could have written this in your post.They might accept an online translation.