Wow your first try! You did amazing work i think! Im busy updating this old renderlayers to passes script. It automatically makes all the nodes and collections and works also with different viewlayers and can be used for single or separate outputs
What i find really well done is that you added that UI list, this really helps make things clear for the user. Using these is a pain in the ass! hahaha i remember the first time trying to figure that out and how to use them. Still need to check online each time i need one.