So much of the population have to eat the cheapest thing possible it'll certainly have an effect. Make it $1 extra for meat, some will take it but many will save the dollar for something else.
I feel it’s not “cheapest” but “easiest” - though the two are inextricably linked: easy leads to cheap.
I wonder if a hole-in-the-wall franchise based on serving Soylent-based food might work - like a Boba Tea or Pho place, but serving insulated mugs of hot Soylent?