If you dont trust the wallet you can use coinomi. There are plenty instructions on YouTube how to use it with blue stacks. Besides it is not uncommon that virus scanners identify altcoin wallets as malware.
I'm using Cryptopia for my Denarius. I also don't like wallets. I remember when I downloaded some Bitcoin Wallet it took ages until Wallet updated every week.
Well, keeping alts at exchanges is even less secure in my oppinion.