Workaround to "import" an exception from a DLL

[frame]

I know I cannot throw exceptions from a DLL, it will crash. So I 
currently use a wrapper that collects exceptions and pick it up 
if the wrapper method returns a failure state.

As I know what type of exception will be thrown, I can copy all 
important data to a new exception object and then throwing it in 
the current context.

However, I wonder if there is way to copy the exception data via 
Throwable interface direct because checking for types via 
typeid() and string comparsion is just meh.

It is possible to fetch the exception data:

// Throwable e;

// this returns null in the program (but works in a debugger 
watch):
MyExceptionObj imported = cast(MyExceptionObj)e;

// this actually works:
MyExceptionObj imported = cast(MyExceptionObj) cast(void*)e;

But for some reason throwing this object directly would crash.

Is there are way to copy the exception data in a new Throwable 
instance that can be thrown from the current context? Or can the 
runtime be tricked by overwriting the TypeInfo in memory? (I 
don't know exactly what the actual problem is.)