Susanna, Did you read my mind? I have exactly the same questions!! For my own work on artworks where I am searching individual files for upload to both Commons and Wikidata, I have created my own tool to prepare an artwork template for commons at the same time as creating a new item on Wikidata (using quick statements).
The only tools I am aware of are the ones Magnus has so kindly made available to use. Personally I use the "create Commons creator template from a Wikidata biographical item" and modify the output slightly to create a category as well, when I find artworks on Commons that are as yet uncategorized. Unfortunately there is no "Create a Wikidata item from this file with artwork template on Commons", but I would love to have that too. Maybe worth creating a wish for the wishlist survey on Meta for this?
Best, Jae