I mean, it is probably not impossible but your would really have momentum against you. When Schlieffen first presented his plan to the German government either the Chancellor or the Foreign Minister of the day (I can't remember which) basically said that if a military man like Schlieffen thought this was the best plan then the political heads must adjust around it.
The civilian government was willing to build their entire diplomatic and political strategy around a military operational plan! An operational plan that, even at this point, could not be executed with the forces then available to Germany (it only got worse with later iterations).
Having subordinated governmental strategy to military strategy for 10 years during peacetime, it would be very difficult to reverse course at the 11th hour.
That sounds horrible, to be honest.
So to sum it up, the biggest problem for the Germans was their dysfunctional political system, where military dictated foreign policy? Without changing that it's unlikely that they could have had actually achievable goals, although just having a more stubborn Kaiser could have gone a long way.