So, last night, after work, I did the kind thing and cut it down.
How sad the small pile it made...
...fitting into a grocery bag with room to spare.
I've stuck the bag in the garage with the thought that once the wood dries I can burn it in the woodstove.
Next I'll have to do something with the stump, because it will probably continue to sprout. I can either dig it out (ugh), or paint it with RoundUp, like I did the honeysuckles two years ago. Decisions, decisions.