No prob. The first game actually has some fantastic mods and also a ton of incredibly well-crafted fan-made levels.
You might want a few tiny mods for Deus Ex as well, though it doesn’t really require much.
Kind of funny that it was “too violent” because you can go through most of the game without even killing anyone. It’s my preferred playstyle, just sleep darts and stealth stuff.
Actually, you’ll have a bit of a rough time if you go in guns ablaze. A lot of people used to shooters end up being obliterated on the first level when they initially play it, which is what happened to me when I first played it on release. Came back to it years later after I’d discovered Thief and suddenly felt right at home.
Edit: Oh, and it’s also available on GOG. Most of the earlier immersive sims (Thief, Deus Ex, System Shock, Ultima, Arx Fatalis, etc.) are.