The most common protection I used to see in Palm Beach consisted of custom sheetmetal boxes dropped over the lights and attached to the sides. With our current codes, you couldn't put a unit in the roof unless it has been tested and approved for impact resistance and wind loads. I'm not sure where you are at, but here is one company with product approvals for our area:
Are there any code or product approval requirements for these "shutters" where(ever) you are? If not, a custom heavy sheetmetal cover is a simple solution. If there is a specific wind pressure or impact criteria you need to satisfy, clue us in and I can do a search of Miami-Dade tested products for you. A glance through the hundreds of "shutter" manuf's listed did not reveal anything that said skylights.That doesn't mean there isn't something buried in there a more exact search wouldn't uncover. I left a message with my storm protection sub, maybe I'll hear from him next week.
Do an advanced search, Catagory= Shutters. I did not see anything specifically for skylights. I recommend you contact some of the companies directly (click on the company name) to find out if they offer anything.
I realize you have a financial interest, but I still say there's a market for added protection. Nothing wrong with putting up a box when a hurricane is approaching, and it shouldn't be hard to build such a box to Miami-Dade standards. All "hurricane-approved" means is that the glass won't come apart, but it can still be ruined by debris. So I'd want the extra protection. This wouldn't be a seasonal thing, it would just be installed when a hurricane is approaching, then removed when it passes. Lots of people have very accessible roofs that they don't mind going up on. Guess I'll go into the business and compete with you. ;-)