I shoot left as well. My only concern would be a right handed shooter using my shotgun and thinking it was on safe when it actually wasn't.
.... One worthwhile "improvement" is to add an oversized safety button. Had it on all my 870s. Cheap and easy to add.... David K.
Easy solution here; don't let people touch your guns!
I didn't like the one I tried, it was too big and rubbed against the outside of my trigger finger when shooting right hand.
I am an ambi shooter but prefer shooting LH, like most I have adapted to the RH safety.
Cheers
You can plug the detent hole and re-drill it offset to the opposite side. I have done this before (I"m a lefty).....works fine....cheaper than buying another mech too....