Passing C# parameters which can “fit” an interface, but do not actually implement it

Try to use the library Impromptu-Interface

[The Impromptu-Interface] framework to allow you to wrap any object (static or dynamic) with a static interface even though it didn’t inherit from it. It does this by emitting cached dynamic binding code inside a proxy.

This allows you to do something like this:

var person = new Person();
var greeter = person.ActLike<IGreetable>();