How to mange a paste event within CKEdit 5 React component?

In short, I posed a question directly in the developer's github issue tracker. With a lot of trail and error in the Javascript console and their eventual answer I managed to control the text coming in the CKEditor with a paste event.

Key points:

• I used onInit prop. onReady didn't work for me.
• The data in the paste event is divided in elements (like html ones) and is being accessed a bit weirdly.

I guess the best way to explain what I did would be to just show the code, so:

<CKEditor
    id={id}
    editor={ClassicEditor}
    data={value}
    onInit={editor => {
        const documentView = editor.editing.view.document
        documentView.on('paste', (event, data) => {
            editor.plugins.get('Clipboard').on('inputTransformation', (event, data) => {
                let accumulated = editor.getData()
                for (const element of data.content.getChildren()) {
                    if (element._textData !== undefined) {
                       accumulated += element._textData
                    } else {
                       accumulated += element.getChild(0)._textData
                    }
                    if (accumulated.length >= SOME_LENGTH) {
                       event.stop()
                       editor.setData('')
                       editor.setData(accumulated.slice(0, SOME_LENGTH))
                       break
                    }
                 }
              })
           })
        }}
        onChange={(event, editor) => {
           const data = editor.getData()
           inputOnChange(data)
        }}
     />

So that's it. I hope this shortens someone else's struggle a bit.