My lefty manual of arms is to keep the left (shooting) hand always on the grip.
I can use a normal charging handle and mag release with my right hand faster than ambi version of both.
Get an ambi safety and cut off part of the lever on the left side so it does not interfere with your left hand while shooting.
on safeoff safeBe sure to leave enough of the lever so you can manipulate it with your right thumb when shooting right handed.
You can hit the mag release with your support (right) thumb while grasping the mag
with your right hand and ripping it out.
To drop the bolt release, I have to use both my left hand trigger finger and my left middle finger. I have arthritis, others may be able to drop it consistently with just the trigger finger.
If you practice, you can get good at bringing your support hand (right) under the gun to smack the bolt release with your right palm.
Practice all the regular drills (reload, tack reload, jams, etc.) both right and left handed every time you dryfire and you will have no need of any left handed rifles.
Gringop