I went through the same frustrations when I took my 1150 to Roy Gardner (RGM) and we settled on replacing the valve guides but keeping the valves. The softer guides were worn but the valve stems were still ok and it reduced the oil consumption effectively.
The whole thread is making me feel good about picking up a pair of very low mileage cylinder heads some years ago, though. They come off an 1100S so have a different exhaust stud pattern, but I also have a set of headers and a link pipe that means the swap is pretty straightforward when the day comes.