Altina can be easily replaced by Winter Altina. Replacing Legendary Leif with Duo Leif requires a few changes: first, he needs to activate his Duo Skill before attacking Ced. Second, before attacking the last thief (so after using the Dancer's Veil) use the Fortifying Horn (so have Micaiah attack her final target first to acquire that item).
Both full F2P and one-bonus-hero scores demote this week on Interval 20, while a two-bonus-hero score maintains.