You are very welcome.
To your goal of allowing devs to set up a RESTful API quickly without configuring controller route, .net core already provides the web api which allows you to hook up with Entity Framework really quickly. IMHO, that paradigm is a very good balance between "quick startup" and "flexible enough for further development". I suggest you to take this approach and try it out, as comparison to your codebase.
Hope this help a bit. :)
That looks to be exactly what I need. I had rolled my own solution using Dapper, as Entity Framework scared me off in the past. Seems to have matured a lot since I last used it.