You can get a child support visa. Ask a visa company. If you have a Thai child, but are not married, you can get a visa so you can pay child support. Not sure how it works. Just saw an ad recently. Also, why are you asking for help and then arguing with every person who tries to help you. I think it is possible this is a bigger problem than your visa issues that you may need to solve.
just come to Thailand and then visit Cambodia before you've been here 30 days. You can get a tour from Bangkok to Angkor Wat in Siem Reap. About 2-3 days. Fly back to Thailand and reset the visa time.
I have looked everywhere, what's the general rate for the AXA 20,000 USD insurance? I am sure there are a lot of variables, but cannot seem to find any numbers.