The cost is on top of the almost £2,500 spent on repairs to the painting, which were carried out by a professional conservator.
Some Stormont parties have questioned NI Civil Service participation over impartiality concerns.
Students at Aoife Nic Giolla Cheara's class found leaflets saying "English is our mother tongue" on their cars.
At Commercial Court the King and Queen met representatives from tourism, hospitality and the arts.
The DUP said "questions remain unanswered" and those who damaged the portrait should foot the bill.
The kerb in Belfast city centre has been blocked off with a temporary barrier for more than two years.
Business groups and campaigners urge the Stormont department to resolve the loophole quickly.
Business owners in Northern Ireland are reacting to the new Budget announced by Rachel Reeves.
Hill Street, which contains several bars and restaurants, was pedestrianised for a trial period in 2020 during the Covid-19 pandemic.
