Help i Lost my locking wheel nut socket,

I have a bulldog locking wheel bolt for the caravan wheels, I have lost the socket to remove them. I have the code for a replacement and contacted Bulldog. They do not have a replacement as the company that made them went out of business 3 years ago. I have seen that you can get a reverse thread socket to help remove the bolts but there is not enough space for the socket to fit between the bolt and wheel. Other than paying out a fortune to have the bolts drilled out does anyone have any suggestions how I can get the bolts off without causing damage to the wheel? Or anyone with a bulldog socket code 7C1 ?