What about the other ASEAN countries' changes after the GWOT like Singapore, Philippines, Malaysia, and Vietnam?
Let's see...
Without Indonesia who still inward-focusing because of the Monetary Crisis, they kinda looking for themselves for recovery.
Singapore with its prominent status would focus to try building relationship with South American nations after America's Great Retreat to avoid falling into China's sphere.
Thailand and Philippines can rally towards Japan, Taiwan, and Korea after the Great Retreat
Malaysia, Myanmar, and Vietnam would falling into China's sphere like OTL
Cambodia, Brunei, and Laos is an interesting case as they can either pressured by Vietnam and China in one side and Japan and Thailand on the other side.
Timor Leste becoming a failed state after getting its oil taken by Australia and only survived because of China