Just running the numbers in my head, I cannot see how viable this is.
A trip from Sanford International to Disney is about an hour and about 45-50 miles plus there are tolls. From a pure economics perspective, the cost of the mileage (lets use the mileage reimbursement rate 0.55/mile) alone is on average $25.00, never the less staff costs, wait time, tolls, parking etc.