You can get pretty much what you want for the M&P's but for me this is the the show stopper.
https://www.apextactical.com/flat-faced-forward-set-sear-trigger-kit-for-m-p
Thinking the wife dose not need a 3# trigger on her M&P
I have these on my Sig P226 and P320. They make them for your Smith as well.
https://www.nightfision.com/product...dot-tritium-night-sights-for-smith-wesson-new