Im a big fan of Stowa, and i am not fond with Stowa recent watches with DIN8330 so far, the Sinn with DIN8330 looks way better.
I dont think it will do anything to the other brand. Its just a certification like COSC.
Out of all of what you mentioned, Laco may release some watches with the DIN. I see Archimede and its watch family like Limes do that too.