Ma Bufang inspires sections of the KMT's western armies to seek asylum in Saudi Arabia after the Chinese Civil War. However, these wouldn't be Asian-Arabs in the sense that you're asking for: people of Asian descent who identify as Arabs and speak Arabic. The Ma family, like other Hui, saw themselves as Chinese Muslims, and took both parts of that identity seriously.
Another option is having the Mongol Empire overseeing some kind of resettlement. Maybe a contingent of Chinese or Korean prisoners of war are deported to Syria, or are pressed into service in the Mongol armies and end up under Ilkhanate jurisdiction at some point. They are stationed in Iraq as auxiliaries, and over the next few centuries of political change they convert to Islam, then begin speaking Arabic, then begin marrying into Arab families to a limited extent until they no longer identify as East Asian.
Finally, if some part of East Asia ends up as an Islamic state, the new rulers may seek to recruit Arabs (most likely Hadhramis from Yemen, who are of the Shafi'i school of jurisprudence) as judges and administrative cadres, as sultanates in India and Southeast Asia did OTL. These Arabs may marry locals and have kids who also marry locals, but who nonetheless are held in high regard for their Arab ancestry (especially if they are descendants of Muhammad). As a result, you end up with a group of people that live in East Asia but identify as Arab and use Arabic as a language of letters at the very least, in the style of similar Black Arab communities in Zanzibar, Lamu, Mombasa, and elsewhere.