You are wrong about TDAC, according to the official instructions found on most Thai Embassy websites, you are supposed to print out the TDAC acknowledgment mail, you receive.

Paper is so smart,

paper weighs nothing,

paper doesn't run out of battery,

paper doesn't require (forgotten) passwords,

paper doesn't auto-off after x seconds,

paper can be easily transferred,

paper doesn't require wifi.

And Thai officials love paper.

Your customers can not be in Thailand, so no need for a Thai bank account, but a account in the country of your customers, so they don’t need to pay for international transfers.

Ansked and answered numerous times.

One of the more complex ways to go with big risk of rejection, and thereby losing the 10.000+ baht visafee.

Depending which Embassy you apply at income is of less importance.

It’s the deposited 500.000 baht at least, which is important.

Read the local Immigration office’s website.

Not savings account, regular immediately accessible account only.

Search the group for the specific embassy you are interested to apply at, and concentrate on answers regarding that embassy only, since requirements differ from embassy to embassy

It cannot be a saving account has to be a normal deposit account as written explicitly on the Embassy website

You should read the Embassy website thoroughly before applying.

Now is high season for visa applications, so expect longer than normal visa processing times.

Additional Documentation will reset processing time to zero