Personally I'd stick with plan A. There is good riding in the Peaks of course, but if I was on my way to the Lakes anyway I'd be looking at a poor weather Lakes alternative. There's a lot of good low-level stuff around Ambleside/Loughrigg Tarn/Hodge Close that would be better than anything in the Peaks in my opinion.
No idea what's on the VG CD. If it's just the Dark Peak stuff what about venturing into the White Peak? With the weather so dry the trails should be pretty fast. There's often a bit more road work to link routes than those around Ladybower and Kinder, but there's some good rocky stuff around Three Shires Head, Macc forest and Hollinsclough that can be linked into a good 3-4 hour ride.