The only time-based qualifiers for global outdoor championships should be:
-the athletes with the top-3 times/marks globally in the current season (one athlete per country, with the season beginning with the indoor season, so approximately December 1 of the preceding calendar year) (3 total "global top-3" wildcard spots per event)
-the athletes with the top time not from a country that has already claimed a time-based qualifier not in the top-3 globally from each of three sets of paired areas (Pair 1: the Americas; Pair 2: Africa and Europe; Pair 3: Oceania and Asia) (3 total "paired area #1" wildcard spots)
-the defending champ in the event from the most-recent global championship (1 total "defending champ" wildcard spot)
-and the winner (or top not-yet-qualified finisher) of a new Diamond League Final-style pre-Worlds meet (1 total "regular season finale meet" wildcard spot)
These spots should all be World Athletics wildcards, and athletes from one country should be able to claim as many as three of the eight of them (one of the global top-3 times or the top paired area time, the defending champ, and the top not-yet-qualified finisher at the new pre-Worlds meet) in addition to World Rankings-based qualifiers. The athlete would select themselves for these spots, not their nation--World Athletics would pay for them, and the number of these wildcard spots earned by athletes from one nation wouldn't affect the number of spots available to that nation via World Rankings (capped at three in every event). All performance list-based qualifying should stop in advance of the new pre-Worlds meet, so it's clear who is already in and for whom that meet is a last chance qualifier.
All places in global championships outside of those eight wildcards should be based on World Rankings* and assigned to nations (up to three per nation). Those nations should be required to either select the athlete(s) who earned the World Rankings-based spots, have a first-past-the-post Trials event for all World Rankings-based spots, or give up the spot to the next nation. These national federation selections would be required to be made in advance of the new pre-Worlds meet, so it's clear who is already in and for whom that meet is a last chance qualifier.
*I'm also open to a certain number of spots in each event (up to three) first going to the top-3 globally ranked athletes in each set of paired areas, and the remainder being done by World Ranking, to assure broad representation from across the globe in what is supposed to be a global championship. But I could be convinced otherwise.
And yes, there is doubtlessly room for improvement in how the World Rankings are calculated, but with this array of wildcards an emergent athlete with a single breakthrough performance would be able to earn their way in through the global top-3 or paired area #1 seasonal wildcard, and also, if they earned their way into the pre-championship meet (the process for qualifying for which should be determined solely by annual global descending order list) via that wildcard as well.
Also, I don't think you can say WA under Coe is more corrupt than it was under his predecessors...