So I spoke to the factory manager, and our conversation actually brought a tear to his eye. It turns out he was funeral director before he moved to the USA and that's how he got his start in the tortilla business. He says that you're a little bigger than the people they usually work for, but it shouldn't be a problem, although he offered an alternate suggestion: the tradition in his hometown is to finely chop the decedent and distribute him or her amongst individual tacos. This would solve some of your logistical problems, but on the whole, a grand single-burrito ceremony in the old style would better suit you, in my opinion. He may have just been trying to unload some factory overruns... Nice guy, though, I think his name was Anibal or Hanival or something.
In any case, we've decided on fresh cilantro, fresh purple cabbage, grated red onion, three different types of corn, crema, queso blanco (a better fit for the black beans according to him), the salsas you've requested, fried serrano peppers, some shredded dried chilpotles, and an assortment of Bolivian potatoes. He also asks if there's a family member or beloved pet that you would like to have made into chorizo - apparently a nice option for some of the guests. I'll send you his info. Please feel free to contact him directly to work out any final details - he was oddly eager for your home address:
Senor Lecter, G.M.
Dahmer and Fish Tortillas
975 Grand St, Sub-Basement C
Brooklyn, NY 11211