If you lose the B then you lose the WP as far as I know. No visa of any descriptio n would invite big trouble not to mentio n an overstay charge of 500 baht a day. Continuing to work could result in jail and deportation at your expense.
The letter I got from the labour office was merely a form showing my WP had been cancelled - nothing to do with tax. Nevertheless my employer(who cancelled it on my behalf) gave me that form too late in the day for me to go to immigration that day to get a Non Imm O based on retirement (I had all the paperwork ready). I went the next morning. I was charged 2 days overstay! Go figure๐
Go to the bank with your print outs and they will do a letter itemizing each month and stating they were IFTs. Letter headed notepaper, signed and stamped. 200B. Another 'guarantee' letter is also needed. I am due next week and I will get the letters from the bank in morning prior to my same day imm visit. All ok last year. Fingers always crossed of course!๐
If a child is "legitmised" by marriage of the father to the mother or by a court, a subsequent divorce doesn't change that legitimisation ie you are BOTH legit parents with equal rights - unless a court changes that situation.