ing a method with a known signature, but dynamic type

So I've been very into bytecode recently, and I want to learn how to use invokedynamic. I've already figured out how to link a static method through invokedynamic, but I have a more specific use case. I want to:

Pass in an arbitrary object to a method (the object has a pre-determined method-signature that I want to invoke, but the type cannot inherit an interface or be determined easily.)

The method should then invokedynamic on that object, and call the given method

Currently my bootstrap method looks like this:

public static CallSite bootstrap(MethodHandles.Lookup caller, String name, MethodType methodType) throws Throwable {
    return new ConstantCallSite(MethodHandles.lookup().findVirtual(null, name, methodType));
}

Where null is what I'm not sure about. I'm basically trying to invokevirtual on the object, but bypass the check to see if the method is actually there (since the statically-bound type of the object will be Object). (because invokevirtual-ing will throw an error if I pass in a class, and a method not in that class).

any help is appreciated!

Edit: Basically I'm trying to implement duck-typing of a sort.

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