Dark arts with the "creature creation" quest, part 2. Wink wink nudge.
I just had an evily trilliant idea, Drastic. For a future modpack, make it permament blood moon.
That would be totally evil ... but the towers with daylight sensor will only open a room and never the other
BTW it allow mob to spawn on tainted land so even after a long time settled somewhere, various mobs can be encountered (not only tainted creepers ^^)