The dirty little secret is that by pulling the clips and lifting the rear of the tank out of the rubber bushings slightly you can pull the tank back far enough to get at the coolant filler. You don't even have to empty the tank or remove the fairings or seat. The guys at Motorad who designed this were really clever.
Make sure you disconnect the tank electrical connector and cover the top of the tank with a towel to protect the paint. Don't pull it back any further than necessary to prevent putting too much strain on the hose connections on the bottom of the tank. When you get a chance it would be a good idea to replace the old lines with new ones that are 3-4 inches longer to allow more freedom to move.