How to qualify for Tokyo 2020 in three steps

As the Combined Olympic event will take place over three days, it would be best to select who will participate in Tokyo based on qualifications run in the same format. On the other hand it is practically impossible to make World Cup organizers set up such 3-days events. The World and Continental Championships would be as close as you could come but even so, such championship with several hundreds of athletes doing qualifications, semi and final will not be the same as the Olympics with just 20+20 participants. At the same time, it would be important for both competitors and IFSC to organize a pre-Olympic rehearsal event that also could make the final selection for the 20+20 that will compete in Tokyo. Such event could run early in 2020 in Tokyo as the Combined World Championship where only 50 + 50 selected can compete. Possibly the 6 + 6 best that have not qualified to the Olympics in 2019 yet, could be selected from the pre-Olympic event. During 2019, 8 + 8 can qualify through the Continental Championship with extra spots for Europe and Asia. The remaining 6 + 6 could qualify through the Combined ranking that already IFSC are running. The selection for the 50 + 50 to the pre-Olympic Combined World Championships in early 2020, could be based on the 8 + 8 qualified from the Continental Championships and the rest from the Combined World Cup 2019. Another possible qualification way could be that the three World Champions from 2018 are guaranteed a spot.