Custom channel names for multilayer EXR

In our post production pipeline, we need to create a single custom channel input format called 'Map'.

Eg: Layer1.Map

instead of Layer1.R,G,B,A.

It is Imperative to control the channel names precisely We don't want a layer named "Map",

We want the layer names empty (Hence why _001 comes up for the duplicate empty string)

We also need Blender's File Output Node to allow us to create multiple empty inputs. As Blender does not allow inputs with the same name, it renames additional empty layers to _001, _002, etc. We can confirm that software such as Houdini is able to do things like this