Using 7* deathless pieces to get the 6*

Stuch

I know that if you get all of the 7* deathless pieces, you also get the 6*. However, for bith deathless champs so far, I’ve only been able to get some of the 7 star pieces. This means I can’t get the 7 star and need to use recourses to get 6 stars. I just wish I could use the 7 star pieces that I actually do have to help count for part of the 6 star. Like I wish I could sell my 7 star pieces to get the 6 star version of them. Or as an even better alternative, perhaps for the future deathless champs, you can make it that whenever you get the 7* piece, the 6 star piece comes with it