How to call a method with struct constraint to unknown struct

Question is simple: I'm using a reflection to get a value. Then if it's a struct, I'm calling a method FooStruct, else FooClass:

        Type type = x.GetType();
        foreach (var fieldInfo in type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
        {
            var val = fieldInfo.GetValue(value);
            object obj = type.IsValueType ? val.FooStruct() : val.FooClass();
            fieldInfo.SetValue(x, obj);
        }

problem is that FooStruct has a constraint:

    public static T FooStruct<T>(this T value) where T : struct
    {
        //...
    }

so question is: is it possible to call this method without using reflection?