I think that offering basic training (at least) which all pilots must take before being allowed to talk on the UNICOM frequency. This training should include information about how to structure the broadcasts and how to listen out for other's broadcasts.
This could be done with a simple powerpoint or Moodle online. A test may or may not be required, depending on how the training is given, to allow the pilots to have at least a basic knowledge of how the UNICOM system actually works. e.g. When and when not to use it, what frequency to use for major airports, etc.
Of course, this is my