That sounds cool but:

1- This Subreddit is pretty sensitive to MTX, so they'll say some dumb shit like: Huhuhu the first to buy TH Keys wins huhuhu.

2- 1b Gp or 500 Total levels sounds like a couple days of gameplay, so the series won't last long with those goals. But! It's a start.

3- If we learned something about the 200M XP archaeology race is that you either no life the game and put in risk your health and financial situation for it (unless there's a global pandemic forcing the world to stay inside their homes), or play at your own pace and be tagged as a "nobody" because the top dogs already took the clout (pages 1.2.3 on the highscores).

The benefits of something like your proposal, would be that people could learn the most efficient methods (after alk it's a race), so there's a goldmine of information and resources available to the viewers if the racers share the guides they used and their methods.

It could also be an incentive to be creative and think outside the box to achieve the goals. So it's not only interesting but also educative.

As for the goals, I'd say PVM on the side at the bare minimum requirements (the ones listed by the game as soon as the racers get them), all the way to Raksha (which is the hardest solo boss i can think of excluding high enrage Telos) would also be cool to watch.

If you want the series to last, make it a race to Max Cape and "Solo" Reaper Crew (which is a placeholder name that includes all bosses except for group bosses).