Judo Canada can reduce the period. Except it's not to Deguchi's advantage to represent Japan. She has no less chance to go to the Olympics.
For weight change, Klimkait already announced that she doesn't want to change weight category to go to Olympics, she wants to stay in 57kg
And with the next WRL update, Deguchi will probably drop out of the top 10. Klimkait will stay #1 in 57kg.
Personally, I'm still not a fan of Nicola Gill's decision to bring Deguchi to represent Canada and compete directly with Klimkait. I know that many have criticized Judo Canada's choice of how to decide between Klimkait and Deguchi for Tokyo 2020
The rules were fair to everyone, and the choice of Klimkait is logical. Klimkait was the better of the two, in 2020-21.