Reddit reviews 300pcs M3 Black Alloy Steel Hex Socket Screws Nuts Washer Assortment Kit (Set B Button Head)
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Made of alloy steel material, the alloy steel material provides strength.Ideal for use in confined areas where the head needs to be flush or below the surface.Fixing component, industrial and construction fasteners.Six common sizes and three optional types for general purpose use.Used widely in the home and office appliance, communication equipments, ship assembly and other machinery industry.
I expect you could have some washers and m3 or m4 pan or cheese head screws on the inside, then have two handles to spread the 12 KG load across 10 holes and 10 washers.
Spring Loaded Surface Mount Handle with Rubber Grip Zinc
It might work with one handle, if you used larger washers.
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300pcs M3 Black Alloy Steel Assortment Kit (Set B Button Head)