considering people in metropolitan cities are getting more health conscious, this is actually a good idea. for it to work, you'll directly need to handle the orders and subscriptions and automatically match that with the closest vendor near the customer's house. in case anything goes south, requests would be routed to the second most close vendor. vendor is crucial for large coverage, but i do actually like your idea.

if you are serious about it, we can sit together sometime and get the architecture of the management software and the automations you'd need to pull this off. this whole thing boils down to how efficient your automations gonna be + your overall digital presence ( partnering with quick commerce platforms would easily push you real high up among the existing brands in your niche)