Nope, not weird. I mean, a main reason I went to see my current T was to talk about my MC (and a bit about my ex-T). When I initially asked if he was open to meeting with me on a short-term basis to deal with some of those issues, he said he'd done similar "consultation" things with clients before. So I don't think it's that uncommon. You would also have the advantage, since you'd be in a different location, that the short-term T most likely wouldn't know your current T, so you could talk very freely. (Even if she did somehow know her, she'd have to keep your info confidential unless you gave her consent.)

Also, I wonder if talking about these issues with a short-term T might make it easier to bring them up to long-term T once you're back in town. Since then you've already shared them.