as far as I know, having an IDP is mandatory if you want to convert it into a Thai license. If you want to get from scratch then there's no need to have a foreign license
They wanna see 500k, just show that off. It doesn't seem a very complicated task to me. You can try your way but don't get pissed if your application gets rejected then
The point Is that we are human and we can make very small mistakes. To make it fair there should be an option to edit that data after being submitted for free or for a small
*****
us$ fee. I know we should pay attention and triple check but getting 350$ busted for a small mistake seems way too much in my opinion