Many thanks to my good buddie Maggie who recommended this book for dyeing with children. You know the kind of thing, dissolve children in boiling water and apply to fabric. Only joking. I'm not really the wicked witch of the north.
I found plastic bag dyeing to be remarkably mess free, fuss free and simple. The instructions were to leave your bags to cure for 24 hours (hah!). I lasted one hour and here is the result. Not too dusty. I have left some comparative pieces still curing until tomorrow
Dyeing with the ravening hordes is beginning to look as if it might be possible after all. Many thanks to Maggie (and Helen Deighan who wrote the book).