Any decent tech can do it. You just need to get him a schematic. All he has to do is lay it out (because the components are bigger) and solder. And test, of course.
What about the dealer who sold you the KEF's? His service tech is probably damned good, and he might be quite keen to do it, just to see how good the speakers can become.
What about the dealer who sold you the KEF's? His service tech is probably damned good, and he might be quite keen to do it, just to see how good the speakers can become.