Hi Piotr,
I think it is a good way to use the steem-only group on Discord. This will make things easier. You can then manually check the articles or you can delegate this task to someone else as you wish, but this manual check will consume some time. But making sure things are going according to set up rules are important to this collaboration in my eyes to get it fulfilled till the end for the good of both sides.
Anyways, good job there with the Community Curation program!
cheers