[Cal.]

How about switch it around and have the housemates in the house watch the housemates in the secret room instead of the other way around? The secret room housemates could be given tasks (like choose a housemate to reward/punish ect)?

The secret room premise is boring now, they've even done one this series although it was sort of different as housemates knew about it but didn't know they were being spied on.