I guess it's not too hard, just some work.
Find all Amazon Spawning lists , remove their content and add whatever you'd like to be in their caves.
Some of the loot in their caves has been kind of amazonified with more jewelery, but that's no biggie, right?
I don't know how many of these lists there are,
but you can find them by finding the amazon NPC's(Editor Id's starting with 'BanditAmazon')in the Object Window's NPC tab of the CS and check their Use Info/Objects and looking up every LVLC object.
I don't think any Amazons are added directly into cells, but if so, you'll see so in the 'Used in these Cells' part where you can just follow the name as a link and manually delete the npc in the Cell View or Render Window.
Hope that helps.