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Up here, the nemesis is burdock. I have tried everything you tried on the yucca for decades and the burdock comes right back. They have taproots that go all the way to hell, they survive years under black plastic, they wilt momentarily from Roundup.

I have planted mint and Bishop's weed after digging them up and both highly invasive plants do not totally crowd out the burdock.

Since they are growing in areas I am filling with flowers, I am reluctant to try salt,

I will monitor this thread for any good ideas.

Mike, I am not sure you can get rid of kudzu. But maybe if you plant burdock? Just kidding. However, I just had a thought: porcelain berry! It is highly invasive and in warm zones (5 and higher), it covers everything, just like kudzu! However, it has pretty fruit in a variety of blues (it is an Asiatic grape family plant). There is a less invasive variety that is variegated, named Elegans. Just a thought. Up here in the North, people plant it on fences and have to be diligent in pruning it back. I only grow it in containers, though. Birds like the fruit and spread it far and wide.