just a thought...
Since you brought up the fact of a foam cover obscuring your labels, what about a clear plastic wrap for the foam cover? That way the person can opt whether to use the foam cover or not, and either way the short user manual and warnings are still there. Unsure what the costs of this would be, but might bear looking into.
Whiskey Tango Foxtrot?
Age Verifier for Trenton/Belleville area. PM me.