Is it possible to own and trade and use my XEM through a paper wallet without downloading a nanowallet on my pc?
Also, the paperwallet i am talking about is one that come through downloading your software.
I don’t think so. You can store tokens on paper wallet but when you want transaction you can’t do this from paper (same for other cryptocurrencies). You must scan (if you have qr code in paper wallet) or put manually to some application and from this app you can send to exchange or where you want.
Scanning code from mobile phone is very quick. Check this. Maybe this is what you are looking for.