Ok, backplates are cheap and easy, along with swapping barrels, so that might be the way to go.
With regard to the slide release, any thoughts on cutting off the right side of the slide release? I'd much rather cut up the cheap part, as opposed to the expensive slide. Also, other than my very brief foray into lefy shooting, while I rehabbed the right arm with tennis elbow, I've had no need for a right side slide release for many years.