A sneaky grenadier with the ability to backstab or drop toy bombs then restealth was really nice in DoS:EE, but I don't feel like it'll work near as well in DoS 2 for a few reasons.

Grenades have like 30% of the radius they did in DoS:EE so it'll be less effective there.

There's less ingredients around to craft grenades with. I could easily make 50+ firebombs in the first act of DoS:EE just from all the empty bottles lying around.

You'll need at least 3 talents to make it work if you want to move, throw a couple grenades, and restealth on the same round. Ambidextrous, glass cannon, and the pawn. I don't know it might be worth a shot, I think the tiny radius on grenades is probably the biggest downside to trying this in DoS 2. As for single vs dual wield, no idea.