fwiw if you haven’t done so already you could suggest a public transport taxi system, we have that here in sweden for rural areas and it works fine.

basically the public transport org just operates taxis that run at set hours, and you can order a ride between any rural address and one of a list of select places in the city. It costs the same as any other public transport operated by the pt org and if multiple people in roughly the same area book within the same time slot then they use a minibus and collect everyone in one run.
You order the ride X hours in advance (in our case 1 hour) and when booking you get a specific time when you should be ready to get picked up.