Well, risking SHRA which is tough when you’re behind! I would suggest what is done for climbing predators and birds (eagles), which is to wrap the tree with flashing, two pieces usually, the upper one overlapping the lower. I think the usual total width is two or three feet. The idea is a span of slippery metal which a raccoon or other can’t climb. You have a difficult situation here though because of the low fork in the tree.I really like this idea (and love the architectural blueprint provided).
Here is the tree. I am still struggling!
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