Could be Nigeria, Algeria and Ethiopia.Ayi also said that there is another African country which signed the purchase deal for J-10CE as well, apart from Egypt. Said country actually signed the deal before Egypt (i.e. the 1st African country to do so, Egypt being the 2nd one), but is more hesitant to pay than Egypt (但第一个国家在付款方面比埃及犹豫).
This matches what the Guancha Trios said in an early-November 2024 podcast (as a side mention of the main discussions on China's 6th-gen manned combat warplanes), i.e. "3 more foreign orders (not including Pakistan)".
Two more mystery countries...