@Wasin Waeosri / @steven.peng
I assumed that the product that you are using should be 'EMA Java' rather than 'Alpha'.
If I'm correct, the answer is no. You have to resolve CUSIP,Sedol& ISIN into RIC first.
Actually, you can put any values for the name parameter in the API level. However, the limitation is from the feed service level that normally supports only 'RIC'.
Note: You can try other products such as DataScope Select (DSS) which is able to search RIC from the other identifier types. Here this is the reference: REST API Tutorial 11: Search by Instrument. Then, you can pass the output in the RIC identifier type to real-time APIs such as EMA.
Hope this helps!