There really isn't a drop in replacement trigger for any of those cva/traditions single trigger. It's really to bad too, a ton of guns have that sh!* trigger, it has to do with the width of the plate itself.
What can be done is to remove the piviot pin and re-drill for a larger hole and pin to remove the slop. A spacer added made from a proper sized shim stock can help too if lateral play is too much.
Most just settle for adjusting that sear screw you mentioned. They really do work quite well, just get used too the trigger travel before it contacts the sear and that spring lock does it's job.
With every lock like that I have/had, I have dis-assembled the thing and polished all of the contact surfaces. Those parts are stamped out at the factory and they spend darn little time removing burrs. I use a fine india stone and rub the parts till they shine.