This is one option. Another option would be to clearly separate ineligible
monuments with a different color. This is how I tried to do it when I still
had an illusion that my effort is needed by somebody.
Looks pretty, though you have only one ineligible monument in this list. I
suppose in my case a lot of monuments with a mark "do not upload to
commons" will look odd.
So, I did some corrections in commons template. Please look, does it work
correctly for Moscow
bridge<http://commons.wikimedia.org/wiki/Category:Moscow_Bridge>now?
If sow, I'll prepare the same for other monuments (eligible only,
unlike Moscow bridge).
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Regards,
Andrij