Yes, the kingdom is much more than food and I pray that non-vegans would stop prioritizing food over the spirit of God!
The exhortation to be vegan is not a food issue, it is a mercy issue. God doesn’t care if your food is offered (by others) to Buddha, to Krishna, or to Darth Vader, but he does care about who you withhold your mercy from. He wants us to “be merciful, just as your Father is merciful” (Luke 6:36). If you kill someone to eat their dead body, you are not being merciful toward them.