Meryl, I also love what you wrote.
I will contribute to whatever is decided about this. I agree that there is no rush, and they may not see it in the paper if the timing is off. Maybe something to his agency that would be forwarded?
I also like the idea of sending something closer to his birthday. It seems a little bit more like a celebration of his life doing it that way, and his birthday will certainly be a sad time for them, as well. It may seem more important to them in April.