You can set it up pretty easily. You just make an LJ post like the one above in your journal and check the box that says "Post date entry". That way, it doesn't show on on your friends' pages. Then you send the link to Camille. She can just put the "mode=reply?" tag onto the end of the URL for the "Leave a comment" button.
Oh, and it turns out you can't post-date entries in a community, so I can't post-date these. However, I did a comment entry for Moonflower, which you can see it on my LJ page, but it didn't show up on your f-page.
![[info]](http://l-stat.livejournal.com/img/community.gif?v=92.1){kind=small}
April 2 2004, 14:57:23 UTC 8 years ago
April 2 2004, 16:12:42 UTC 8 years ago
April 2 2004, 16:29:03 UTC 8 years ago
Sorry.
Oh, and it turns out you can't post-date entries in a community, so I can't post-date these. However, I did a comment entry for Moonflower, which you can see it on my LJ page, but it didn't show up on your f-page.