Certainly. In the absence of the head tube to rear axle radius, the wheelbase is a pretty reasonable approximation. given that the drop from the smaller wheel size is 25.5mm (622-571)/2, and all things being equal, the fork being roughly 25.5mm shorter, the rotation of the bike is roughly 3 degrees or ATAN (51/980), in the case of a 98cm wheelbase.

As for the 650c, certainly the 700c might be preferable - there are advantages to both, I was simply suggesting that "23" needs to look into keeping the wheel sizes the same, either 700 or 650, but not both and not with a shorter front fork - a 32-34mm trail on a TT bike with the bull bars cutoff seems a bit, um, imprudent.

btw: I believe the new P5 drops the bottom bracket 12-15mm. I believe it's still in the 250mm range, but they're definitely making the move to lower the overall profile of the frame. :-)

best.