All kidding aside, it's not a bad idea to be able to make a white-out travel plan. So why not practice and validate your plan against the actual climb you do. Cautionary note: don't fall into a crevasse at for the sake of maintaining your bearing. That would really suck!
It seems to me the worst place to develop such skills would be on a vast expanse of glacier in AK or something similar. So it's probably overkill for the CD route, but go for it, and have fun, and don't get locked into too much precision. Then see how good your plan mapped out against reality.
Just my random thoughts.
-r