There are metal-detectable filaments you can use, which may help (although I’m not sure if they’re food safe; presumably the suppliers will respond to business inquiries though!)

For a business, Prusa probably makes sense. You lose money when things don’t turn out right, so spending a bit more up front is the right choice.

Beware that FDM prints are full of tiny holes which are basically impossible to thoroughly clean, so they can be “food safe” for the first use, but once they’re used they may be dirty forever.