Dynamic type generation or wrappers around interfaces in PCL?

Question

.NET

For my needs, I'm trying to make a proxy class generator around interfaces. That is, suppose there is an interface

interface ITest
{
    void DoTest(int arg1);
}

There is a helper class

class Helper
{
    protected object proxyCaller(MethodInfo executingMethod, params object[] args) { ... }
}

In the usual ClassLibrary, it was possible to generate a class that inherits from Helper and the specified interface (for example, ITest) using AssemblyBuilder and TypeBuilder .

ITest obj = GetInstanceFor<ITest>();
obj->DoTest(1);

Calling obj->DoTest results in a call to proxyCaller, in which I can do already conscious actions and return the result.
In short, it turns out a transparent proxy, only with your own hands.
There was a task to do the same for PCL, so that the library could be used for WP8, Win8, Android (Mono, there is, they say, support for PCL with a tambourine). But, as it turned out, in PCL the Reflection.Emit mechanism is either missing or severely cut off - type- and assemblybuilder are not available.
Tell me, please, is there a way to implement a similar dynamic wrapper for interfaces without additional libraries?
I tried to do it through DynamicObject (I didn’t work with them before), but it didn’t work out for me, although it looked tempting