I really x1000000.44 want to see lair cards for the spawns rather than putting them on the monster cards.
Lair cards are what do the spawning, they are what do the variable count spawning, Lair cards are should be where the spawn rates are.
This enables you to fix issues like races that don't have or spawn captains (clockwork and infected) and also gives you a format for custom lairs types, either for specific story quests (this lair spawns only melee bugs), for factions that have multiple minion types (this is the grubber archery tower), or for factions that should share a minion type / lair (this is the razorfiend hovel. Razorfiends are their own faction, but also a slave minion to the dragon knights.)