Ten competed in the Sporting Class, while another 10 contested the Junior Class championship.
Weather changes during the final two races added difficulty as drivers fought for championship points.
Ison previously represented the country at the Asia Finals in 2024 and 2025.
“This year, we will train harder than ever to get the best results for the Asia Finals,” Ison said.
Velasquez, meanwhile, will make his Asia Finals debut in Bangkok.