It appears that your only other alternative is to get a 60 Tourist Visa from London Embassy online turnaround is approx 5 days although they do recommend allowing 15 days
Once you are here in Thailand get in touch with a Visa Agent straight away thery are everywhere in BKK and Pattaya, they will open a bank account for you and discuss other options for a 1 year visa this service costs around 30k baht (You do not need to have the 800k money in a bank account) this method is not the correct procedure but a lot of people use it.
Other than that you will after wait until your legally married to a Thai and that will open other options up for you like a 1 year marriage visa ( 800k baht not required)obtained at Savanakhet Laos which means you leave the country every 90 days and return totally legal and legitimate
If you could please copy and paste something from an official Thai Embassy website that states the amount of times you are limited to flying in and out of Thailand during any given period then you have an valid argument
If not then all this bulsh*t about being pulled up on your 2nd /3rd Tourist visa entry into Thailand is totally irrelevant