Is it possible to configure MetaTrader to work with these exchanges? 
The simple answer is YES.I do trade some coin like ETC on fxsimple.com using their metatrader 4 platform
However i doubt if those exchangers will allow an external body to do the metatrader configurations on their platform because of the safety of the people's coin unless you will sincerely collaborate with them.
That used to be a reliable forex broker, didn't it?
my profound apology for the wrong website address quoted, here is the right address https://simplefx.com/dashboard you shall see variety of cryptocoin instruments to be traded on metatrader here.Good luck and sorry once again for the wrong address.
Ah yes SimpleFX. It is a great platform indeed. I use it often, along with whaleclub.co. Both are great sites for crypto-->stocks/bonds/forex etc.
If anyone feels the need to join whaleclub, feel free to spread the love by using my aff link: https://whaleclub.co/join/WNZFth 
