I have an idea.
How about next years OWC there should be a requirement for the skill cap. Lets say there are certain songs picked out by the management that has a similarity of the difficulty for the maps that are going to be brought to the next years map pool. If people can pull off those off then they should be able to qualify for the tournament. On top of that, the countries that have the biggest population on this game could (doesn't have to) have reserved spots, due to the amount of players that there are in the country in example:Japan, China, US, Taiwan. They probably require more time in order to get their players chosen, that seems natural to me.
First come first serve is the most logical idea, since if the captains can't get their players chosen or to take action properly in a small duration, then it's their fault they didn't make it.
In all honest, I don't believe in the metric system, PP is already a disaster, I'm already assuming ppv2 is also going to be another calculation based system where people will figure out their way on how to farm those points just the way like the current system and the ranked score system was. Numbers don't always mean everything, it's about the skill that the player has.