Can I switch from a Non-B work visa to a DTV in Thailand?

I did this but fairly early just a few months after DTV was released. They might have different processes now but they granted me the dtv based on working outside Thailand

As far as I remember my business visa was active but my work permit already expired by a few days and the company was already issued for closure

When I came back I essentially had two active visas. So I had a short back and forth with immigration.

They didn't know what to do at first, so they wanted to talk to my accountant

I talked with them in Thai and they just weren't sure what to do so they had to call a higher up. In the end they cancelled the work permit on the spot and also made a note inside there saying its cancelled. Then I stamped in with the dtv

Yes, I did 8 years on Non-B then switched to DTV after cancellation of WP and Non-B extension. I showed money in Thai bank account earned from Thai salary and final settlement

There have been a few posts about it. Cancel the B visa. Leave and apply for DTV. Same process for most visa switches. The original has to be cancelled first. For example going from O to B the O has to be cancelled before applying for B