It may be more work but can't u use tracker to accomplish this?

For a 1 in 20 chance a global/HoF must end on say 22, 44, 66, 88, or 00.

For a 1 in 500 chance it must end in 321.

For a 1 in a million chance it must end in 12345.

That stats aren't right but you get the idea.

The best part of this is the results are transparent. When an item is won everyone will know.