So, I survived
I'm not sure what the final deal will work out to be, but Mme. Durst said I spoke very well and she thought I could handle her first and second year French, possibly third year as well. Not the AP classes, of course. I wouldn't feel comfortable doing that -- not when the AP test is at stake at the end of the year.
So, I may end up doing just half-day student teaching, which will mean doing 15 weeks instead of 10, but that will let me work and be sane for the duration.
Then I just need to find out what additional classes I need to take for the ESL endorsement...