Do you need/want this menu to be dynamic? It’s a pretty simple menu to have to jump through the hoops of configuring the calls or tpl chunks to be able to show the children as siblings.
The simplest may just be to have two Wayfinder calls, the first for the main tree and the second for resources children which would look kind of like this:
This would give you IDs 180-183 as the first part and then the children of the Resources doc beside resources. It’s not necessarily ideal but it would work.
Other options include playing with the chunks, a static menu or using a where clause to get the menu items by some other property such as a field or TV has a specific value. Similarly, you could just use &includeDocs if defining the menu.