China's interest is only China!
For that you'll have to understand their philosophy "Five principles of peaceful coexistence"...
Unless core Chinese interests are directly threatened or sabotaged, China will not bite.
For the regional stability it has to be Pakistan, Türkiye, Egypt, Iran and Saudi Arabia setting the core regional security and economic architecture and forever bar any foreign intervention in the region. The mechanisms should be set forth to resolve disputes and smaller statelets cut down to size... they can exist but not on the backs of foreign patronage.