Long Range Wired or wireless Transport Ideas, low power consumption

Hello, Long Time network engineer (Cellular Backhaul & Carrier Access) here for a major carrier in the US.

While I have worked for a large carrier in the US, I have ventured out starting another company providing managed networks & Voice Services to medium - small businesses on the side.

I am faced with a rather peculiar situation. I need to get critical communications to a remote area on top of a mountain used for logging purposes. (Don't worry they only take some trees and leave most so they can reseed, very environmentally forward thinking company).

There is literally no cellular reception on top of the mountain or electricity. I would like to stay away from satellite. Generally a generator or battery with a DC to AC converter is used to provide power at the top of the mountain. At the basecamp at the bottom of the mountain there is cellular reception for a number of carriers and would like to install a cellular modem and carrier that connection up the mountain somehow. There is also power at the bottom of the mountain.

The total distance line of site is about 900 meters and if you follow the logging road up there it is 1700 meters total. Line of site may be a bad idea because it is a forest and trees fall all the time. So likely a new drop would have to be run every year at the minimum.

I come from an optical only transport environment and first thought why not just run some direct burial fiber single mode fiber along the logging road. Just need to rent a ditch witch run a little over a mile of fiber and have 2 endpoints with 1310nm 10km optics. For this application, I think this would be overkill.

Other thoughts including using a Ubiquiti wireless point to point solution to get it up the mountain, although I could see this using a lot of power that they just dont have.

At the top of the mountain I would like to have an ATA and WAP. This would be so emails, ect could be sent as well as phone calls (voip) and emergency communications.

A tower out of the question as they do not want to leave a footprint.

I was wondering if anyone hear has faced a similar issue and if they had any ideas. I think even a 10Mbps connection would be more than sufficient for this application. Preferably I would like a copper based solution that could run line of site on the ground, and just be buried under the logging road when it overlaps it or a wireless RF based solution that can transport data long range.

Any ideas would be greatly appreciated.