I understand the difficulties but you are still left with the problem that what is stated in the AIP is not binding by ATC. Your choice seems to be stick with the AIP holding fuel and see what happens at the other end or squeeze on another 5 minutes of traffic fuel. The other alternative is to declare a fuel emergency if your fuel will go below statutory reserves. The airlines and Airservices have once again put all the responsibility on the crew to come up with a solution to the problem of what should be carried for traffic holding. Good luck!