Nested layout for all subpage except the index

I have a folder with articles with a nested layout.

page "/cambiate/*", :layout => :cambiate_layout

But for the index page in the folder I would like to not apply the nested layout.

I tried:
page "/cambiate/index.html", :layout => :layout

But that didn’t work.

Since the list of article changes frequently, I would really like to use the /* rule but with an exception.

Any ideas?