Alipay, Wechat Pay both utilize direct debit to link the cards/accounts to their service, rather than using CUP network, most probably due to lower service fee.
Therefore it is not possible to link CUP cards issued outside Mainland China or use those card on Alipay/WeChat as if it were cards issued in Mainland China.

Even Alipay/Wechat Pay can link some cards of oversea banks, the use is greatly limited to payments of certain type.

However, the ICBC(US) credit card probably can be used on many sites that support CUP online payment, including 12306.cn(railway tickets), 10010.com(recharge Unicom mobile) , jd.com(online shopping),