Thanks Ted.
The whole yard is lined with azaleas so I'm not too worried about keeping this one but it's nice to know that I don't have to sacrifice it. I am a bit more worried about transplanting trumpet vine roots with the shrubs.
I was having a look-see online, and found
Ortho Brush-B-Gone Poison Ivy, Poison Oak and Brush Killer Concentrate.
I wonder if that would work? I do plan on planting lettuce there next year and the Ortho is supposed to degrade faster than Roundup.