Can I use a sponsor for the 500,000 baht requirement for a DTV Workcation visa in Thailand?

The official rules are implemented at the discretion of each embassy, which means even if you cite the official dtv website statement it wont apply if the embassy wont allow it. There are no appeals. The embassy has the final say. Your best bet is to contact the embassy and pose as a prospective applicant requesting further information regarding their specific rules regarding sponsorships. Remember, the whole purpose of the dtv is to keep out those who have no skill to survive and may run out of money. I know it’s not fair but you really need to get direct info from the embassy and perhaps ask whether a soft power route plus sponsorship would work for your situation.

Each embassy has its own rules

They tell you what to supply, if you don’t in time rejection is round the corner, loosing 10.000+ Baht visafee.

Sponsor letters are usually for parents sponsoring their children's dtv- dependant. I've only read maybe 2 or 3 people who were able to get their main dtv approved with their parents sponsorship letter. This doesn't happen often (not to say impossible)

Workcation is for people whose online earnings enable them to live in Thailand.

If you need someone to sponsor your visa, it means that you are not financially independent. Which implies that you need someone else's resources (money) to fulfill your basic needs (rent, health, food, etc.).

Therefore, I have a hard time seeing why you will be granted a DTV - workcation.

Some Embassies allow and others do not. There was a recent one from Australia

Usually sponsor is for a dependent DTV - when parents are applying for a DTV for their minor age child, they serve as the young child’s sponsor. However, You can easily do a quick search and see other case examples

Who was your sponsor? The acceptable list is quite narrow. What sponsor proof did you provide?