For May 14, I'm finding a couple of 100,000 mile options to MUC:
1) CVG-LGA-ATL-MUC, and
2) CVG-BOS-AMS-MUC.
Also, JFK-FRA and ATL-FRA are available at low business. And it's a relatively easy train ride, or drive, from FRA-MUC.
However, having said all this, it looks like there's only one low seat available for any of these options. When I enter 2 travellers, the mileage goes to 200,000. Or 130,000 in Y. Maybe half a loaf is better than none?