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What you are asking for isn't easy to do.
I'm working on a new discogs script at the moment, which will be able to split certain roles (like featuring) from the extraartist field and write it to a extra field. However, I was only thinking for extra fields like COMPOSER and so long, joining these fields with the existing ARTIST field is another problem. I'm not sure if I can build that in.
Anyway, here is a topic about a similar problem. I think you could adopt this action to Pufas' script output and your desired "featuring" role. You will also have to make sure that the ARIST field don't gets completly overwritten.
/t/13197/1