The spec on the KO2 34x10.5R17 says that the diameter really is 33.5 and the width 10.6. 285/75/17 are really 33.8 and 11.2 respectively. So they're pretty close. But I want narrow.Metric Tire Conversion
This is where I usually go for quick reference of available tires. I doubt it's utterly comprehensive, but is a good sampling. As 1911 said, if you go a bit wider the 285 75 17 is close to 34. The 34x10.5's aren't a true 34, and as you noted only in KO2. Maybe LX or Tundra wheels would give you more options?