I’m happy to see keys being inserted into rewards, however, making them top 3 only is not really going to help your promise of making them accessible.
Top 3 can keep the choice box (although 2nd and third need to be bumped up to 500) and the rest of the ranks get a chance box with 500, 250 and five star token amounts. This is similar to the way you guys used to run the level up when there were toons involved.
This is my preferred, start including them in milestones in the third spot after this event is over. If the third spot is for a new event, then make them in the second spot along with arena tickets or when torches roadmap stop running.
If you are truely serious about making them accessible to all, please consider these changes.