How do I effectively get last 5 tweets from a list including myself?


I’ve tried this before, but without success.
I own a small community with 3 administrators. All of us have Twitter accounts and I have a 5 tweets long stream on my website. I would like this stream to include tweets from me and the 2 other administrators without allowing others to add something to that particular stream.
So lists won’t solve it because I can’t put myself on it, and I can’t use a hashtag and the search method because that would allow others to put things there.
I’m not going to share a twitter account for the community, because people should be able to follow the admins individually, and also know which of us have posted the Tweet.

Any other solutions to this problem?