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Those maneuvers are extremely dated and simple, some calls details have evolved, but the basic movements required should serve as good practice items.
With regard to 40m, I believe that is the international (non US) team standard, it’s close enough to play - the only challenge it presents is during “follow the train” maneuvers where kites with shorter lines are leaving wake or turbulence, through which anything on longer lines will have to fly (like driving a bumpy road).
Worst case, it’s easy enough to shorten within a few minutes, which I am happy to personally assist with if it’s agreed to be advantageous.