No, there is no longer any sort of work camper program associated with Fort Wilderness.
There are many campers that stay long term over the winter, or over the summer, and many of them do work part time at Disney, but as far as the campsite, they pay the same rates and compete for the same discounts that everyone else does. (Although once they are employed, they may be able to qualify for a general Cast Discount).
The type of work category that you would want to apply for is Casual Temporary. For your initial employment, you have to give them 6 weeks, then after that, you can work a few days whenever you are there. There is a probably a minimum number of days you need to work per year to stay on the roles, but don't know the details on all of that.