You don't need to purchase any top-level domain, just a bunch of regular domains: dearleader000001.kp, dearleader000002.kp, ....
If you are, say, the North Korean government, or have a close relationship with some small island registrar, you can register any number of domains you like for peanuts.
If you are, say, the North Korean government, or have a close relationship with some small island registrar, you can register any number of domains you like for peanuts.