Dear Backup T,
I hope you reply at some point in the next day or two. I'd really just like to have an appointment on the books for when Dr. T is away. I know it's not for nearly 2 weeks, but no idea how booked you are. I also have this probably silly fear that you won't be willing to meet with me because I emailed you about that thing with Dr. T regarding the standing up thing around 2 years ago (feels like much longer ago due to the pandemic). But I wouldn't do that now. And I really just wanted you to give me a reality check at the time, not take my side against Dr. T or something.
--LT