If you are set on kydex then disregard all after.
I'd recommend the Aker cuff/light combo https://www.copsplus.com/prodnum9602.php. I have used Aker's leather cuff and a mag/flashlight combo since I started plain clothes in 2000. I carried them every shift for a couple of years but infrequently now because of my assignment. They have a belt slide and a removable paddle. I used them with the belt slide and it kept them close to my body and fairly concealable under a shirt. Even after 15 years they are in good condition.