I worked briefly as a maintenance controller and a new boss wanted to put his mark on the outfit by changing everyone's schedule. We had found an employee that preferred working nights, he became the night MX controller. When new boss hired on he decided that MX Controllers would rotate shifts so nobody got "stuck" on nights. New schedule meant nobody was happy and nobody ever got used to working nights. Every call to MX Control was answered within the first 30 rings because nobody had spent more than a few days trying to work nights and sleep days.
I've been working nights for over 10 years. Being a permanent night person is the low-cost answer. How is permanently assigning one or two controllers to work nights not the answer? A nap is all but mandatory for night workers. It's better than the harshest coffee. That the FAA prohibits naps tells you more about the FAA's denial of reality than all the vaccum tubes in all the computers they operate.
From the Reagan National "news" story I understood that each ATC cab has a telephone line called a "shout line", accesable to other ATC facilities for getting someone's attention even if they aren't plugged in. It activates a PA speaker in the facility.
Only a bureaucrat would try and fix a problem of not enough work to keep a man awake at night by assigning 2 men to share the workload.