I think it could be done, but you’d probably want a cassette that doesn’t have it’s own spider, rather than one where all the cogs are joined together. I think they would be too close together for a good effect.
You would then need something to hold them all together again once they have been formed & painted.
Or you could split a cassette & form the individual cogs into flower shapes by curling the edges up, perhaps cutting in from the sides towards the centre, so you have sections (petals) and then using wire or some other ‘stem’ painted or covered in something green to make the stems.
It sounds like a great project & something that would be right up worldclassaccident’s street…..