I agree that proper markings on the spec. sheet, bulb and carton will minimize problems -- and they certainly have for the many years that such medium-base, low voltage bulbs have been used.
But with the great variety of "fool-resistant" bulb base types these days, there's little reason to continue to make and use a screw-base configuration that is so easy to apply incorrectly and which is unsafe and now expensive (because of LEDs) if a mistake is made.
Time to fix the problem -- a permanent socket adapter and the use of a lamp with a low-voltage base would be a simple, cheap fix that anyone can do.
Tomsic