I was actually looking for another broker to complement Interactive Broker (I don't trust a single broker), I did go through other US brokers and while many actually support international clients, they are pretty much USD and US/Canada market centric. Singapore brokers charge a high commission. Robinhood is only for US customers for now. EU brokers work with only EU customers (the exception seems to be Saxo bank) due to some regulations. It seems the simple solution for me would be to use a local broker (which charges approx. 0.4% trading fee and 0.12% per year custody fees and some other fees, lol).
TDAmeritrade has an office in Singapore but you have to be a Singapore PR or citizen to open an account. They are the only one with no trade fees.