There is no way to display multiple icons in a column using icon rules.
If you python-fu is up to it then at least in theory you could write a custom template function that checks if a combined icon does not exist, creating it if it does not. This would require the function to use various image manipulation tools to create a new icon. It would return the name of the correct icon file, perhaps newly created. You would use that custom function in an advanced template.
I said "in theory" because I haven't ever tried to do image or file manipulation in a custom function. Should work, but YMMV.
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