I don't think they actually do last meals anymore. I mean they do, but i'm pretty sure they just have a menu that lists the items they have in the kitchen, to choose from. on account of i'd request some totally rare item that took them foever to find and they wouldn't be able to execute me until they found it. because of that exact scenario that's why I assume they don't do special requests, and if you couldn't decide on something, then they'd just give you something you didn't want and then execute you whether you ate in or not.
Honestly I really wouldn't care what I ate. It's not like you're going to be having the memory of the best meal you ever ate, you'll be worm food in five minutes. I guess maybe the worms will appreciate the fine dining that's mixed in with your carcass, but I doubt they really care either.