Back to the topic, Chinese should have its own campaigns for free as compensation imo.
(1) Conquest of Gokturks
Tang Chinese allied with Uyghurs to conquer Gokturks.
(2) Lushan rebellion
Tang Chinese allied with Uyghurs to fight against Lushan rebels. Tibet fought Tang from the West simultaneously.
(3) Tibetian invasions
Tibetians threaten Tang Chinese from the West and allied with Nanchao to harass from the SW. Tang Chinese fought back over highlands/ capital regions and suppressed Nanchao.
I think it can be a separate topic. I post this here as this can be a compensation and I have limited knowledge on Chinese history. Maybe some Chinese players can help extend Chinese campaigns.