Thanks everyone!
No shirtz1, the ants were not very disciplined (let alone trained!), so I didn't end up rescuing the food in time. I did eat the first half of that cheesecake before the shoot though! :-)
I had a similar idea for an assignment a few months back, but I couldn't get the ants to cooperate. I tried chumming them with every sweet treat imaginable, but to no avail. I may want to rent your pair in the future.