Export multiple resolutions/formats/versions in single export preset

Question

I would like to be able export multiple resolutions of a project at the same time into separate folders. I can kind of do this now by having multiple export presets and running each of them right after the other and then letting them export simultaneously. Even though the export preset has a folder name specified, I have to manually type in the unique project name into each export preset. Unfortunately  this becomes a little bit cumbersome as I often use 3 or 4 export presets for each project, and I may be exporting multiple projects at the same time. Obviously it makes sense to just type the unique text once (or have it automatically read from metadata) to avoid typos and make it easier on me.
I think there are two parts to make this work. The first is using metadata to name the folder name (to ensure unique foldernames), and the second is to allow "export preset groups" that export multiple presets together.
Here is my scenario:
I have three export presets:
600px saves to subfolder "project 600px for web"
2400px saves to subfolder "project 2400px for print"
600px watermark saves to subfolder "project 600px watermark"
So I have to type the real project name, replacing "project" three times for each project. This information could be easily entered automatically because lightroom already has that metadata in the folder name, or collection name.
This could be entered for the folder name in the same way custom file naming is done with the Filename Template Editor.
Another option would be use the Custom Text field in the Filename Template Editor to manually enter the project name if it's not already in some metadata field.
All of this already works great with the file name options, it just needs to be applied to the folder name as well.
Once the folder naming is taken care of, just group multiple presets into a preset group, or allow to select multiple presets at once, and exporting multiple resolutions/formats/versions of a group of images is made easy.

Answer 1

Thanks Rob
Your export plugin does allow running multiple export presets in a single group, however it still doesn't address the folder naming issue. Using your tool, I can easily initiate my multiple presets in a single export, however I am stuck using the generic foldername that I specified in my original export preset. This means that after the export completes, I still have to rename the folders to the particular project name. I would save the time of typing the project name into lightroom, but then just have to repeat that same task later outside of lightroom. It also prevents me from exporting two projects at the same time (or one after the other) because both projects would end up in the same generically named folders.
That said it is a useful plugin that I will likely use under the specific scenarios where it does work.