Ah, a disciple of solipsism, I see.

Jeg er i færd med at lære dansk (og norsk), men jeg kan forstå næsten alt I har skrevet.

were they speaking hiberno-english by any chance?

I suggest looking into Turkish cuisine or any cuisine influenced by the Ottoman empire for ideas on vegan cabage rolls. Look for sarma or dolma to get inspiration for fillings. You’ll get some results with grapevine leaves, but you can substitute cabage or sour cabage if the filling fits.

To echo the other poster, a good starting point would be mushrooms, rice/barley, spices. Could probably add some walnuts in there, or pecans.

Try looking at what cigkofte is made of (the veggie one, not the raw meat one) to maybe get some inspiration?