Having constructed two electric car rebuilds and having done solar and wind installations on a land co-op I can speak to some of your ideas. Two of those installations involved 2 windturbines shared by 5 households, with each household also having their own PV system of various sizes. I found the technical aspects far less troublesome than the social ones. While they were willing to split purchase and installation costs evenly, there was always friction about somebody using more than their fair share of power from the turbines. Combined with storm damage and general wear and tear, the added social unrest eventually caused them all to ditch the shared systems and the added complexity of wind to move toward expanding each of their individual PV systems. I would encourage the same, but perhaps with a shared general fund that could be accessed by individuals wanting/needing to start or expand their individual systems. And I'd suggest the hiring of a maintenance person to troubleshoot, repair, and upgrade systems. That leaves responsibility for power use, basic maintenance (if any), and borrowing for upgrades, up to the individual system owner. The person responsible for more complex maintenance, troubleshooting, and upgrades can start out fairly novice but will quickly gain extra knowledge through experience with varied system configurations.
In terms of EV ports, again, I'd leave those up to individual households or you will experience the same "have/have not" problems about who has an EV and who doesn't, how often they charge, and how much power they use from a shared charging system. Some will only need a Level 1 port or may have a plug-in hybrid or smaller pack, used less frequently. Others will have a big pure EV with a bigger pack and possibly much more frequent or long-ranging use. Individual systems make users take full responsibility for purchase and power use while the community funds the "bank" for those needs.