from 18 Oct 2021, you can trade MSCI CHINA A50 CONNECT INDEX FUTURES FROM HK Exchange currently, you can trade FTSE XINHUA CHINA A50 INDEX FUTURES from Singapore exchange all these should be good for day trading
The Thai stock market is a great market to trade as it is more inefficient than the larger markets. I've traded/invested in it for about 20 years. With more efficient markets its better to buy an index fund...