Switching brands shouldn't be a problem for an experienced plumber without wall damage.

Valves behind walls determine the brand. Unless walls can be cut open for access. From behind, maybe? Kohler is an excellent brand, so you have some organic issue somewhere else in your system. Diagnosis of your issue should be performed first.

If you have an X brand valve in the wall, you need to stay with X brand trim.

If you can open the wall and replace the valve assembly with a Y brand valve, you then can use Y brand trim.