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I really don’t have any non-destructive way to suggest, other than what you’ve already tried. But to answer the other questions, the bushing is the threads for the needle–that’s all. It is used on many carbs 10hp-up. Part # is 303947 if you are forced to destroy it. $$$$ at marineengine.com. I’ll bet there are lots of them in member’s goody boxes.
To assemble it, put the packings on the needle, followed by the bushing screwed on only a few turns. Then the packing nut slipped onto the other end. Now, using the packing nut, push the whole assembly into the carb. Tighten the packing nut just enough to keep the bushing from spinning. Now screw the needle all the way in to gentle seating, and back out 1-1/2 turns and tighten the packing nut some more. Final adjustment when running as usual.
If you must destroy the bushing, split it off the needle. I presume the bushing is easier to find/cheaper than the needle.