I've used the one that came with my 950. Whether or not its better than the one included with the Switch, I don't know, but it seems to work.
Cool, yeah I did some searching and I guess USB-C won't give devices "too much" power or whatever. The device itself will limit what it can recieve. So it sounds like it's safe. I'd mostly just use it to plug in while playing in bed. My phone's battery life is also fantastic (lasts 2 days easily) so even if I'm not charging while I play, I could play in bed for a bit then charge overnight without having to go put it back in the dock.