Can I enter Thailand on a new DTV visa after having a Non-B visa with re-entry permission?

Because they have a reentry permit, they will likely not be allowed to enter on DTV.

You cannot "switch" visas like that.

As the DTV is not activated, the nonb still is in effect with the reentry permit.

If the work permit is already canceled and you did not cancel the extension, then your reason to stay ended the day you stopped working, you may be subject to a hefty fine.

Should have canceled the extension before leaving Thailand.

I am curious to see how this works out.

I am in the exact same situation and I am entering Thailand in 3hours after my DTV was approved

Note that my work permit already expired, I just have the non-b valid until 15feb

I can let you know in few hours

Are you on a non B extension or the original visa? I'm guessing the extension. In that case you should be able to enter on the DTV and cancel the extension in country. You can't have two valid visas, but you can be on an extension and request a visa.