... and what deal would Germany get?
Even if the plotters had succeeded in seizing power, and there was no guarantee of that, with or without a small-scale civil war the problem is going to be who they were and what their ideas of a just settlement with the Allies was. A majority of them wanted to keep the 1918 borders with Poland, a small group argued for annexing all of it, whilst another that some concessions would have to be made; IIRC they wanted to keep the
Anschluss and Bohemia; that there be no occupation of Germany and that any investigation or prosecution of war crimes be carried out internally by the German legal system. The Allies had already announced their demand of unconditional surrender and made plans for the occupation of Germany so that simply isn't going to fly, looking at the plotters I'm honestly not sure that the majority of the military members wouldn't just say fuck it then and carry on fighting rather than accept that. The Allies aren't going to budge either, from their point of view this is that second time in a couple of decades that German militarism has started a war and dragged them into it so they were gong to make damn sure that there wasn't going to be a third time.