What you are looking for is quite elaborate and requires a great deal of expertise. I am skeptical that you will find that, at the quality that you're looking for, in the realm of $4 per hour. When it comes to the role of a professional communications agent - internal and external, you truly will get what you pay for.
I submit my bid, fully recognizing that this remuneration proposal is wholly over your budget, but with the recognition that I could meet your objectives in all of these areas.
However, having also experienced some strategic human relations strategies during my career, if this position has been posted at a lesser pay grade so as not to attract quality candidates and allow you to promote someone from within who maybe has demonstrated the tenacity and enthusiasm to do the job, but doesn't have the skills on paper for your H.R. department to support their installation, I can understand that as well.
Your position as posted is quite engaging and I welcome the opportunity to discuss it at greater length to share what skills and experience I bring to such a role and if that would provide a good fit for your team.
With respect,
Vern May