Way for BHVR to work with players that already own the prime cosmetic
Since this month's prime cosmetic is from a previous rift those that grinded the rift cannot use their codes. I think BHVR should work with those players so they do not feel like the prime partnership is a waste.
What could be done is similar to when BHVR did the survey to complete 7 trials and give feedback in exchange for BP and iri shards. In this case have players with Prime provide their unused code as well as their cloud ID so BHVR can see that they in fact do already own the Plague cosmetic. Give players until September 15 to fill out the survey. Then compensate those players with iri shards that are equivalent to a purple outfit in the store. BHVR can then do give aways with the codes they received - either use fog whisperers or social media.
Doing this will not only make it so those that already owned the cosmetic not feel like the prime partnership isn't worth it but also give other players the opportunity to get the cosmetic.