Yep, they've been doing this for a long time with photos; I'd think 100 years or more. I recently saw an episode of "Finding Your Roots". David Duchovny's grandmother died in the early 1930's. A photo was added to her headstone at that time, and it still looks good today.
While this goes against a collectability perspective, strong lamination in one form or another would be the best preserver against the elements if the card is just going to stay there forever. Just visit your nearest monument seller. They will know what to do for you.
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