@chayro - thanks. They are on the other side of the globe (I live in Norway) but I will check them out. Qualified impartial advice is very valuable. And I've actually bought from Oakland before ; - )
I finally got around to disconnect the Teac NT-505 from my main system, carried it to the office system, and connected it there. The difference was larger than I had imagined, compared to my current solution (Thinkpad T14 laptop + Topping e30ii). My small office system sounds much better with the Teac. Both PCM streaming and DSD file playback. Not even a close match, compared to the Topping. In a way, not strange, considering the cost and effort involved.
I have no idea, how much is due to the improved streaming, or the better DAC, but I think it is both. The music both sounds better (I associate to the DAC) and seems more undisturbed (I associate to the streamer).