English:Hello,
I don't know if you are from Czech, so I write here in multifunctional language. I already understand what you mean by that question. This way, you probably think so, it doesn't work. You'd have to buy the keys to Steam again. However, you can add non-steam games to the steamer, for example from the original, but you will still have to have the origin playing and you will have an overlay in the steamer, but it will still not be a steam game.
Česky:Zdravím,
Nevím, zda-li jsi z česka, tak zde píšu multifunkčním jazykem. Už jsem pochopil co tím dotazem myslíš.. Tímto způsobem, jak to ty nejspíše myslíš, tak to nejde. Musel by sis koupit klíče na Steamu znovu. Můžeš si však do steamu přidat non steam hry třeba z originu, ale pořád budeš muset mít puštěný origin a ve steamu ti sice půjde overlay, ale pořád to nebude steam hra.