Simply put, allow the player to choose between monocrystals, iridium or vouchers according to side of conflict. This should allow players to choose to upgrade modules for pilots who are infavourable to scenarios such as PvP or competitive team activities and allow players to access open space for more materials as a daily bonus (in the case of vouchers), or to grind for more materials to access a higher grade arsenal (monocrystals).
Discuss!