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.
Yea it is very insecure and not recommended to store coins on exchanges.
If you want a good option to store your coins without having to wait for anything to download/sync/etc. feel free to purchase a Cold Storage Card, they are well worth it for the security and make great gifts!
http://whopper.io/product/denarius-cold-storage-card-black/