I think it's possible in Jemplode to create an "arbitrary" soup view based on a search criteria or a specific field. I forget exactly how to do it. But once you've done that (soup views based on the comment field), you follow those same steps but at this step...

Into each artist playlist, put the loose songs by that artist, copied from the "Artists" soup views.

...instead of using the "Artists" soup views, use the special soups you created based on your comment fields.

I think this can be done...