I used a 5ft curb key and flattened the opening closed a little bit. The 5ft curb key was 5/8 opening to start (I think). I closed it down to the 1/2 size.
Still had some concern regarding the wrench binding up against the well casing (because the curb key was so wide). The T handle also got in the way of the other T that was holding the pitless adaptor. Craigpumps idea would be the best way to go but the curb key can work in a pinch (also, not the standard short lenth curb key but the long 5 ft size).
Water continues to flow at my new house thanks to all who contribute here !