Ugh. I hate poison ivy!
If you know someone who is not affected have them clean it up for you. I would suggest brush killer but you are next to a pond. Or maybe cover it with several layers of black plastic and leave it until next spring and remove it then? Good luck!
Darrow and Chandler are good blueberry varieties. Chandler has a long picking season you have to check the same bush regularly. Bluecrop, Duke, and Blueray too!
If you like fresh figs (dried are nasty) there are some that would do well in central MO.
I think my only hope to get rid of this particular patch of poison ivy will be to snip the vines and apply Tordon RTU to the stumps.
Some of the vines are 1”+ thick, and are grown up into a huge multiflora rose bush and some wild plum and persimmon trees.
It’s a seriously bad patch of poison ivy.