Since your trading account is domiciled in USD currency, check if your broker offers other account base currencies. If they do, check is the minimum deposit is still 50 units of that base currency. For example, if your broker offers ZAR account base currency, check if the minimum deposit is 50 ZAR. if that is the case, open another trading account in ZAR currency and whenever you want to withdraw, move the funds to the ZAR account and make the withdrawal. 50 ZAR may be less than 50 USD when converted to your local currency where you live if you get what I mean.