I think there should be some consumable to trigger a double dice reward, similar to the bonus days effect.

It can have a time limit, or a X uses per consumption, or stacks of uses that consume automatically.

I know shards are like go to for bypassing silvers bunk rewards and going for golds sweet rewards, however this would be another tp sink.

Conversions are important, however I think 25tp for two hits/uses sounds about the best ratio. I think this would spur a lot of players into spending favor points to gamble on that 100.