Based on my research, you can open an account with a couple of European and Australian fx brokers if you don't mind incorporating an LLC or an LTD in a foreign country. I'd recommend to choose a reputable jurisdiction because it will be easier to open a bank account for a company registered in Singapore than with a Samoa based entity.
You should talk to the brokers before incorporating your offshore entity so you will know which place they gonna accept.
Don't worry, I found many brokers that would open an account for your foreign registered entity. Don't forget to get a local address for your company though. This whole thing can be done for $1 - $1.5k. Let me know if you need some help.