Rather than worrying about the format of the document, worry about the approach. The best way to get things implemented is to get the decision-makers passionate about it, and have them take ownership of it as if it's their own idea. Here is one way to do that, feel free to adapt the steps to suit your personality, but remember the goal is to inspire passion for the idea.
Step 1: Send an E-Mail
Catch their attention with a brief executive summary distilling the important points you want to make so that it can be scanned in 2-3 minutes max. A simple 5-paragraph (Introduction, Point A, Point B, Point C, Conclusion) would be fine so long as you keep them brief. The conclusion should be simple like:
This e-mail is just scratching the surface -- if you're interested in discussing this more, I'd love to sit down with you. I am free at the following times:
- July 9th, 9:00-9:30
- July 10th, 2:00-2:30
- July 11th, 4:15-4:45
Let me know when is good for you
Step 2: Passion > Proposals
When you get a meeting to discuss it, don't focus on "$3-$4 for every $1 investment!" This person is in charge of "workplace environment and satisfaction" -- don't act as if he/she is the Chief Financial Officer. Explain what wellness means to you. What it means to your family (if you have one). Why you love it. Why you studied it. Why you want the company to support it. Passionately.
You want to convince the Chief Cultural Officer that regardless of cost, wellness programs are a great way to improve the workplace environment and satisfaction.
Step 3: Selling it to their bosses
If you do step 2 right, they will be passionate about your idea and want to sell it. Your job is much easier -- you give them a wealth of information on the benefits (financially), how to confirm them (calling up health plans or whatever, how to get whatever numbers are needed from other sources), and then let them find the best way to present it to their bosses.