There are alot of people in this situation. Let's say for example you use Coinbase but really want to invest in XRP or BAT. What can you do to invest in these coins? The best way to do this other than searching, signing up, and verifying more accounts is just to buy a generic coin your exchange carries (Bitcoin, litecoin, etc) and then use a low cost digital exchange and trade your coins out. There are a few of these types of free exchanges, specifically Changelly or Shapeshift.io . The fees are very low, and the rate you will get is listed before you trade anything. There are no other exchange fees, they are factored into the displayed rate when you put in what you want to trade from and to. So if you really want some XRP or Vechain, etc download one of these apps. It's much easier than finding a new FIAT exchange for your digital currency needs. 
Sort: Trending