Can I override a AInstancedFoliageActor and use it?

The title says it all pretty much. I need to override the default AInstancedFoliageActor in C++ and make it get used in my levels instead of the default one, which is this one:
image

Is it possible or do I need to change the source code?

Did you find an answer to this? I also would really like to know.

Nope. Unfortunately not. I guess that as far as I know, the only way is to directly modify the default one in the Engine source.

Yea I also digged into it with no luck. Thanks for letting me know.