It would take work and there's no pressing reason to do it. I can imagine what it would be like if you told me you went on a 5 mile hike with your 6'6" friend

It would take work and there's no pressing reason to do it. I can imagine what it would be like if you told me you went on a 5 mile hike with your 6'6" friend on a 63 degree day. If that was 8km, 2m, and 17 degrees I have much less intuitive sense of what happened. And I don't see much advantage to switching - it doesn't matter which units you use so long as you're consistent within the domain of use. What's the downside?