Dick, how do you propose they provide this service, this low without a Radar ?
Class "E" that low without surveillance will only slow things down and build in more delays.
What about the TACAN app ?
How is 1200' AGL going to be depicted on charts ?
No good using Alice as an example, it has ML en-route providing service down to 8500, then Alice TWR staff provide D to the surface. Very different to what your proposing.