Actually, I'd say that even in the UK the detachable shower heads that can be attached to a fitting are most common - at least in my experience.
What you do get in nicer showers is both a large fixed shower head and a detachable shower head.
What you do get in nicer showers is both a large fixed shower head and a detachable shower head.
If any of you entrepreneuring types want to make a kit and throw it up on Kickstarter, the idea is all yours.
I can't find it now, don't remember the name, but I purchased it a couple years ago from Amazon, so I should be able to get the name if you are interested with a bit more time.