Suddentwang - care to elaborate on your icing at 2500' with a zero isotherm at 6000'? Carb icing or engine icing maybe, but not airframe icing.
The weather IIRC was just claggy warm sector conditions, no embedded CB or severe rotors with moderate turbulence at worst. Fine weather for an IFR transit if that is how you have planned it and can get in at the other end.