You have to wonder how "valiant" the plotters would have remained once the WAllies rejected their surrender proposals. I can see them crumbling very quickly, unfortunately for them.
Yes i get it the wallies will reject the offer. So what ? The german army will stil go with every division to the east, leaving the west open to invasion. So the wallies will stil have to follow it, conquering a lot more territory then they did on our timeline, or not, maybe they will just take Germany and let the whermacht starv it self out fighting the soviets. We must remember, there is no Yalta yet, no peace of paper with percentages for Churchill to present Uncle Joe with. That only happened because Romania changed sides in a bad moment, and the soviets were aproaching Grece.