For Soft Power, no documents about your job are listed as necessary

No, soft power lists "Participants of activities such as Muay Thai courses, Thai cooking classes, sport training, medical treatment, seminars, music festivals, etc. ". Not sure what the etc encompasses but needs to be of cultural, significance and approved by the government, so there would be not a lot outside what is listed.

Account needs to be in your name

Check the information from your consulate. The Sydney one explicitly says "Applicants for a Thai e-Visa at the Royal Thai Consulate-General in Sydney must be in Australia for the entire application process." And most if not all consulates would be the same

If you feel like a holiday, may be a good idea. But it is possible the documents would need to be in English or translated, if not already

Consensus here is that no one understands the question . Why would it not be allowed.

Which flavour of DTV are you thinking of applying? Workcation or soft power? It sounds like on the surface of it, neither. If you really want to apply for the DTV, it sounds like soft power is the way to go. and your partner (needs to be legally married and present a marriage certicate) and son can apply for a dependents visa based on this.

Agreed

There are so many facets to this question - the ability to open a bank account on a DTV, if the thai gov would even try to enforce it. But let's say that it is brought into thailand, and you have stayed in thailand more than 180 days. Technically, it is taxable by the thai government and you technically should do a return. But due to tax treaties between Australia and Thailand to avoid double taxation, this is taken into account in both countries and you as someone has already said end up paying the higher tax of either country.