The best way to fix this would be to make all clothing glamours, weapons, hairstyles and bardings character-specific and make all minions, mounts, rewards and orchestrion rolls account-wide. If they cannot do the latter, then let alts purchase those items with certificate points so long as at least one character has redeemed the code for the item. Like if I redeem the code for Yotsuyu on Character 1, allow character 2 to purchase the minion with achievement points.