[First, I understand what you mean, and what you're trying to do. My town certainly has places like this for medevac helicopters.]
I think this information clearly does belong in OSM. It's a fact about the real world, and it's easy to verify. But, I don't think they are "helipads". It might be good to call them aeroway=medevac_landing_zone because while there is an access for emergency notion, what you proposed would propertly apply to something that is constructed as a proper helipad and in FAA databases, etc, but just allowed for emergency use only. (I know you know this:) A LZ is really just a place that's not for aviation but which is prearranged to use if necessary. Stephan's point that these should not show up as helipads on normal maps is valid; they should show up as medevac landing zones on maps that want to show landing zones. Presumably the same maps would show water sources and hydrants.
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