I admit that this is pretty much the only method to get the on / off image working, but an idea lingers in my thoughts that it is possible to set the line
ECO_ENERGY-METHANE (KML)|| 5000
automatically introduced into the existing poi_visiblities.txt, then modify its content using lua commands
as is already possible to change the icon to be used in old skins for primo
ECO_ENERGY-METHANE (KML)|%content%\userdata\usericon\metano.bmp|5000
in order to assign the correspondence of the .icon and finaly have
ECO ENERGY-METHANE (KML)|METANO|15000
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