Also a lefty, shooting a right handed rifle. Some have brass deflectors, some do not. Never been burned by brass unless it bounced off something else.
Only one of my guns has an ambi safety, and it also has an ambi charging handle. The rest may get them eventually, but it's not a priority. I've trained enough using right handed only mag releases and bolt releases that I prefer the set up. No need to add a bunch of expensive greeblies to try to get the gun to work around me, I simply work around the gun. I have long fingers, so dropping the bolt with my index finger is easy. Mag changes aren't a problem either, just gotta find a method that suits you, and train.