That already exists, with kind 30041. https://wikistr.com/nkbip-01*dd664d5e4016433a8cd69f005ae1480804351789b59de5af06276de65633d319/nkbip-01*70122128273bdc07af9be7725fa5c4bc0fc146866bec38d44360dc4bc6cc18b9
30041 only functions as a modular article, if you link it to a 30040 index. Otherwise, it's just an Asciidoc article.
Interesting.. So how does this work in practice? You create a kind 30040 header event and add kind 30041 article/section events in the e tags of the header event?