Cliff change?

Hi guyz, i'm back to MapMaking : D

So, I want to change cliffs like I change tiles, I mean, I have Lordaeron Summer as a tilesets, and I want to have Dalaran Brick Cliffs next to Lordaeron Grass Cliffs on my pallete.

I knew Jass NewGen Pack could do it, but I can't make it work on newest patch, and switching back to old versions gets me to different errors.

Is there anything similar what could allow me to change cliffs? And if not, could you please (anyone who is capable of doing so) make me a blank expansion map with Lordaeron Summer as the main tileset with Dalaran Bricks as alternative cliff?
K, thanks :-D

You can find the cliff skin blp in the war3.mpq or war3x.mpq and import it into your map with the path of the cliff skin you want to replace, if all else fails.