Hence the 'keeping it inside' part. I would not plan outside a vine or something that may interfere with my other plants, until I know what it is.
Still, I fail to see the harm of growing the seed inside to identify the plant. People here have reported receiving cucumbers and strawberries. No one has reported receiving vines or anything else.
I am very surprised by the level of fear and paranoia regarding everything and especially China: we are looking at horse gift in the mouth, then saying it is a bioterrorism plot. Unbelievable!! When I was a kid, that would have been the best mail-order present ever!
Also, regarding kudzu and the like, I fail to see the harm. The environment changes. We may not like that, but that's how life is. Instead of trying to undo changes, maybe we should adapt to them.
Kudzu seems good for livestock, rich in protein and isoflavones. Trying to burn it seems to be due to a distinct lack of imagination and profit motive. It's a free input!!! Find new ways to chop it down to feed it to livestock. Make it into a food supplement.
Anything looks better than just destruction and nostalgia for the time it wasn't here. It's here now. Adapt!