You mean cut down the 50+ year old grape vine? They might tar and feather me if I did something like that.Can you cut down that scrubby brushy/vine thing and PULL OUT the other corner post that the brace goes to and then just put in a new one in the same hole???? Or all the different utility companies will have to come out.... or I would just use the telephone pole.
How bad is the post in the ground once you cut out the brushy thing? Maybe doesn't need replacing????
I'd do the same....to me that would be a bonus. The worst that can happen is they make you change it, but how often do they look at those things, seriously?